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Common Weakness Enumeration

CWE-93

Allowed

Improper Neutralization of CRLF Sequences ('CRLF Injection')

Abstraction: Base · Status: Draft

The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.

402 vulnerabilities reference this CWE, most recent first.

GCVE-1988-2026-0382

Vulnerability from gna-1988 – Published: 2026-09-11 11:55 – Updated: 2026-09-11 11:55
VLAI
Title
Dovecot Security Advisory 3/2026
Summary
Hi! We're sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those vulnerabilities. This advisory will also be published at https://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0003.html --- Classification: TLP:GREEN Internal reference: DOV-8476 Type: CWE-403 (Exposure of File Descriptor to Unintended Control Sphere ('File Descriptor Leak')) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2025-11-25 Solution date: 2026-08-26 Disclosure date: 2026-08-26 CVE: CVE-2026-33263 CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) Details: submission-login: Panic when mail_max_userip_connections is reached: Panic: epoll_ctl(del, 8) failed: Bad file descriptor. When mail_max_userip_connections is set (defaul t 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues. Risk: If running in high-security mode (default for community releases), only the new submission connection gets terminated. If running in high-performance mode (default for Pr o releases), all connections handled by the submission-login process will be terminated. The crashes can cause failure for user to send a message, or it can cause duplica te messages to be sent. If TLS is not used (in the backend server processing the submission), duplicate deliveries cannot happen, because the crash can only happen at AUT H stage. No publicly available exploits are known. Solution: Limit the number of connections handled by single submission-login process. This has a performance impact though. Update to non-vulnerable version. --- Internal reference: DOV-8874 Type: CWE-400 (Uncontrolled Resource Consumption) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <3.0.7, OX Dovecot Pro core >=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-03-11 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: ylwango613@yeswehack CVE: CVE-2026-33607 CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) Details: Dovecot IMAP LIST match_sub() Exponential Backtracking — CPU Denial of Service. An attacker that has valid credentials can use IMAP LIST command to consume CPU. Risk: This can cause degradation or denial of service for IMAP. No publicly available exploits are known. Solution: Monitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed version. --- Internal reference: DOV-8884 Type: CWE-400 (Uncontrolled Resource Consumption) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-03-13 Solution date: 2026-08-26 Disclosure date: 2026-08-26 CVE: CVE-2026-27852 CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Details: DoS by sending mail with bad header. An attacker that can send mail to a user can craft a message whose headers contain a very large number of email addresses or MIME par ameters, which causes excessive memory usage when the message is later parsed. Risk: The message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it, causing denial of service for the affected user. No publicly available exploits are known. Solution: Update to non-vulnerable version. --- Internal reference: DOV-8941 Type: CWE-93 (Improper Neutralization of CRLF Sequences ('CRLF Injection')) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-03-24 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: thanos_haruki@yeswehack CVE: CVE-2026-33606 CVSS: 4.8 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N) Details: dsync: Mail content can cause dsync protocol injection. Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administ rator later runs dsync with the stream protocol, for example during a migration. Risk: Injected commands can modify mailbox state on the destination during migration or replication, including internal mailbox attributes that a user should not be able to set directly. It can also cause dsync errors. No publicly available exploits are known. Solution: Avoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version. --- Internal reference: DOV-8947 Type: CWE-655 (Insufficient Psychological Acceptability) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-03-24 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: heckintosh@yeswehack CVE: CVE-2026-33604 CVSS: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N) Details: SMTP Smuggling via Missing Dot-Stuffing After Bare Carriage Return. An attacker that can get Dovecot to relay a message, for example through Sieve redirect or submission relay, can use a crafted line ending in the message body to bypass the outbound protection that prevents message content from being interpreted as SMTP commands. Risk: A downstream mail server that hasn't yet fixed the SMTP smuggling vulnerability can be tricked into treating part of the message body as new SMTP commands, allowing injec tion of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. No publicly available exploits are known. Solution: Where you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to non-vulnerable version. --- Internal reference: DOV-8949 Type: CWE-400 (Uncontrolled Resource Consumption) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-03-24 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: djvirus@yeswehack CVE: CVE-2026-40014 CVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) Details: IMAP THREAD REFERENCES O(N²) CPU DoS via Crafted References Header (index-thread-links.c). An attacker that can send mail to a user can craft a message header that makes the IMAP THREAD command consume CPU disproportionate to the size of the message. Risk: When a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for IMAP. No publicly available exploits are known. Solution: Monitor system for abnormal CPU usage, kill the offending process and remove the offending message from the affected mailbox. Update to non-vulnerable version. --- Internal reference: DOV-8991 Type: CWE-124 (Buffer Underwrite ('Buffer Underflow')) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-04-02 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: ilyar@yeswehack CVE: CVE-2026-40013 CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) Details: pigeonhole: Stack Buffer Underflow in Pigeonhole ManageSieve CHECKSCRIPT/PUTSCRIPT. An attacker that has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script. Risk: This causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for script management. This might be able to be used for re mote code execution. No publicly available exploits are known. Solution: Disable the ManageSieve service if users do not need remote Sieve script management. Update to non-vulnerable version. --- Internal reference: DOV-8994 Type: CWE-400 (Uncontrolled Resource Consumption) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-04-02 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: ilyar@yeswehack CVE: CVE-2026-33605 CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Details: managesieve-login: Pre-auth crash. An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authenticating. Risk: If running in high-security mode (default for community releases), only the attacker's own connection is terminated. If running in high-performance mode (default for Pro releases), all connections handled by the same managesieve-login process are terminated. Repeating the attack can cause denial of service for Sieve script management. No publicly available exploits are known. Solution: Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. --- Internal reference: DOV-9039 Type: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-04-08 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: tipsennn@yeswehack CVE: CVE-2026-40018 CVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N) Details: MySQL multi-byte escaping wrong. None Risk: None No publicly available exploits are known. Solution: None --- Internal reference: DOV-9041 Type: CWE-400 (Uncontrolled Resource Consumption) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot CE core >=2.4.3 <2.4.5 First fixed revision: OX Dovecot CE core 2.4.5 Discovery date: 2026-04-08 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: ilyar@yeswehack CVE: CVE-2026-4
Severity
No CVSS data available.
Impacted products
Credits
Relationships
reference GCVE-1988-2026-0382 (this record)

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "Security Advisory",
          "vendor": "Dovecot",
          "versions": [
            {
              "status": "affected",
              "version": "unknown"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Aki Tuomi"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Hi!\n\nWe\u0027re sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those \nvulnerabilities. This advisory will also be published at \nhttps://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0003.html\n\n---\n\nClassification: TLP:GREEN\n\nInternal reference: DOV-8476\nType: CWE-403 (Exposure of File Descriptor to Unintended Control Sphere (\u0027File Descriptor Leak\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2025-11-25\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nCVE: CVE-2026-33263\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nsubmission-login: Panic when mail_max_userip_connections is reached: Panic: epoll_ctl(del, 8) failed: Bad file \ndescriptor. When mail_max_userip_connections is set (defaul\nt 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues.\n\nRisk:\nIf running in high-security mode (default for community releases), only the new submission connection gets terminated. \nIf running in high-performance mode (default for Pr\no releases), all connections handled by the submission-login process will be terminated. The crashes can cause failure \nfor user to send a message, or it can cause duplica\nte messages to be sent. If TLS is not used (in the backend server processing the submission), duplicate deliveries \ncannot happen, because the crash can only happen at AUT\nH stage. No publicly available exploits are known.\n\nSolution:\nLimit the number of connections handled by single submission-login process. This has a performance impact though. \nUpdate to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8874\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c3.0.7, OX Dovecot Pro core \u003e=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \n\u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5\nDiscovery date: 2026-03-11\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ylwango613@yeswehack\nCVE: CVE-2026-33607\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nDovecot IMAP LIST match_sub() Exponential Backtracking \u2014 CPU Denial of Service. An attacker that has valid credentials \ncan use IMAP LIST command to consume CPU.\n\nRisk:\nThis can cause degradation or denial of service for IMAP. No publicly available exploits are known.\n\nSolution:\nMonitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed \nversion.\n\n\n\n---\n\n\n\nInternal reference: DOV-8884\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-13\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nCVE: CVE-2026-27852\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nDetails:\nDoS by sending mail with bad header. An attacker that can send mail to a user can craft a message whose headers contain \na very large number of email addresses or MIME par\nameters, which causes excessive memory usage when the message is later parsed.\n\nRisk:\nThe message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it, \ncausing denial of service for the affected user. No\n publicly available exploits are known.\n\nSolution:\nUpdate to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8941\nType: CWE-93 (Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: thanos_haruki@yeswehack\nCVE: CVE-2026-33606\nCVSS: 4.8 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N)\n\nDetails:\ndsync: Mail content can cause dsync protocol injection. Mail content stored by a user can be crafted so that it is \ninterpreted as dsync protocol commands when an administ\nrator later runs dsync with the stream protocol, for example during a migration.\n\nRisk:\nInjected commands can modify mailbox state on the destination during migration or replication, including internal \nmailbox attributes that a user should not be able to set\n directly. It can also cause dsync errors. No publicly available exploits are known.\n\nSolution:\nAvoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8947\nType: CWE-655 (Insufficient Psychological Acceptability)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: heckintosh@yeswehack\nCVE: CVE-2026-33604\nCVSS: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)\n\nDetails:\nSMTP Smuggling via Missing Dot-Stuffing After Bare Carriage Return. An attacker that can get Dovecot to relay a \nmessage, for example through Sieve redirect or submission \nrelay, can use a crafted line ending in the message body to bypass the outbound protection that prevents message \ncontent from being interpreted as SMTP commands.\n\nRisk:\nA downstream mail server that hasn\u0027t yet fixed the SMTP smuggling vulnerability can be tricked into treating part of \nthe message body as new SMTP commands, allowing injec\ntion of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. No publicly available \nexploits are known.\n\nSolution:\nWhere you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to \nnon-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8949\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: djvirus@yeswehack\nCVE: CVE-2026-40014\nCVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)\n\nDetails:\nIMAP THREAD REFERENCES O(N\u00b2) CPU DoS via Crafted References Header (index-thread-links.c). An attacker that can send \nmail to a user can craft a message header that makes \nthe IMAP THREAD command consume CPU disproportionate to the size of the message.\n\nRisk:\nWhen a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for \nIMAP. No publicly available exploits are known.\n\nSolution:\nMonitor system for abnormal CPU usage, kill the offending process and remove the offending message from the affected \nmailbox. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8991\nType: CWE-124 (Buffer Underwrite (\u0027Buffer Underflow\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-04-02\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-40013\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\npigeonhole: Stack Buffer Underflow in Pigeonhole ManageSieve CHECKSCRIPT/PUTSCRIPT. An attacker that has valid \ncredentials can submit a Sieve script containing an extreme\n numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script.\n\nRisk:\nThis causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for \nscript management. This might be able to be used for re\nmote code execution. No publicly available exploits are known.\n\nSolution:\nDisable the ManageSieve service if users do not need remote Sieve script management. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8994\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-04-02\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-33605\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nDetails:\nmanagesieve-login: Pre-auth crash. An unauthenticated attacker can crash the ManageSieve login process by sending a \nsmall malformed command before authenticating.\n\nRisk:\nIf running in high-security mode (default for community releases), only the attacker\u0027s own connection is terminated. If \nrunning in high-performance mode (default for Pro \nreleases), all connections handled by the same managesieve-login process are terminated. Repeating the attack can cause \ndenial of service for Sieve script management. No \npublicly available exploits are known.\n\nSolution:\nRestrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-9039\nType: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5\nDiscovery date: 2026-04-08\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: tipsennn@yeswehack\nCVE: CVE-2026-40018\nCVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)\n\nDetails:\nMySQL multi-byte escaping wrong. None\n\nRisk:\nNone No publicly available exploits are known.\n\nSolution:\nNone\n\n\n\n---\n\n\n\nInternal reference: DOV-9041\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot CE core \u003e=2.4.3 \u003c2.4.5\nFirst fixed revision: OX Dovecot CE core 2.4.5\nDiscovery date: 2026-04-08\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-4"
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GCVE-1988-2026-0020

Vulnerability from gna-1988 – Published: 2026-09-07 13:20 – Updated: 2026-09-11 11:55
VLAI
Title
Dovecot Security Advisory 3/2026
Summary
Hi! We're sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those vulnerabilities. This advisory will also be published at https://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0003.html --- Classification: TLP:GREEN Internal reference: DOV-8476 Type: CWE-403 (Exposure of File Descriptor to Unintended Control Sphere ('File Descriptor Leak')) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2025-11-25 Solution date: 2026-08-26 Disclosure date: 2026-08-26 CVE: CVE-2026-33263 CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) Details: submission-login: Panic when mail_max_userip_connections is reached: Panic: epoll_ctl(del, 8) failed: Bad file descriptor. When mail_max_userip_connections is set (defaul t 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues. Risk: If running in high-security mode (default for community releases), only the new submission connection gets terminated. If running in high-performance mode (default for Pr o releases), all connections handled by the submission-login process will be terminated. The crashes can cause failure for user to send a message, or it can cause duplica te messages to be sent. If TLS is not used (in the backend server processing the submission), duplicate deliveries cannot happen, because the crash can only happen at AUT H stage. No publicly available exploits are known. Solution: Limit the number of connections handled by single submission-login process. This has a performance impact though. Update to non-vulnerable version. --- Internal reference: DOV-8874 Type: CWE-400 (Uncontrolled Resource Consumption) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <3.0.7, OX Dovecot Pro core >=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-03-11 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: ylwango613@yeswehack CVE: CVE-2026-33607 CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) Details: Dovecot IMAP LIST match_sub() Exponential Backtracking — CPU Denial of Service. An attacker that has valid credentials can use IMAP LIST command to consume CPU. Risk: This can cause degradation or denial of service for IMAP. No publicly available exploits are known. Solution: Monitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed version. --- Internal reference: DOV-8884 Type: CWE-400 (Uncontrolled Resource Consumption) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-03-13 Solution date: 2026-08-26 Disclosure date: 2026-08-26 CVE: CVE-2026-27852 CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Details: DoS by sending mail with bad header. An attacker that can send mail to a user can craft a message whose headers contain a very large number of email addresses or MIME par ameters, which causes excessive memory usage when the message is later parsed. Risk: The message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it, causing denial of service for the affected user. No publicly available exploits are known. Solution: Update to non-vulnerable version. --- Internal reference: DOV-8941 Type: CWE-93 (Improper Neutralization of CRLF Sequences ('CRLF Injection')) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-03-24 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: thanos_haruki@yeswehack CVE: CVE-2026-33606 CVSS: 4.8 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N) Details: dsync: Mail content can cause dsync protocol injection. Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administ rator later runs dsync with the stream protocol, for example during a migration. Risk: Injected commands can modify mailbox state on the destination during migration or replication, including internal mailbox attributes that a user should not be able to set directly. It can also cause dsync errors. No publicly available exploits are known. Solution: Avoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version. --- Internal reference: DOV-8947 Type: CWE-655 (Insufficient Psychological Acceptability) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-03-24 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: heckintosh@yeswehack CVE: CVE-2026-33604 CVSS: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N) Details: SMTP Smuggling via Missing Dot-Stuffing After Bare Carriage Return. An attacker that can get Dovecot to relay a message, for example through Sieve redirect or submission relay, can use a crafted line ending in the message body to bypass the outbound protection that prevents message content from being interpreted as SMTP commands. Risk: A downstream mail server that hasn't yet fixed the SMTP smuggling vulnerability can be tricked into treating part of the message body as new SMTP commands, allowing injec tion of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. No publicly available exploits are known. Solution: Where you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to non-vulnerable version. --- Internal reference: DOV-8949 Type: CWE-400 (Uncontrolled Resource Consumption) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-03-24 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: djvirus@yeswehack CVE: CVE-2026-40014 CVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) Details: IMAP THREAD REFERENCES O(N²) CPU DoS via Crafted References Header (index-thread-links.c). An attacker that can send mail to a user can craft a message header that makes the IMAP THREAD command consume CPU disproportionate to the size of the message. Risk: When a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for IMAP. No publicly available exploits are known. Solution: Monitor system for abnormal CPU usage, kill the offending process and remove the offending message from the affected mailbox. Update to non-vulnerable version. --- Internal reference: DOV-8991 Type: CWE-124 (Buffer Underwrite ('Buffer Underflow')) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-04-02 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: ilyar@yeswehack CVE: CVE-2026-40013 CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) Details: pigeonhole: Stack Buffer Underflow in Pigeonhole ManageSieve CHECKSCRIPT/PUTSCRIPT. An attacker that has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script. Risk: This causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for script management. This might be able to be used for re mote code execution. No publicly available exploits are known. Solution: Disable the ManageSieve service if users do not need remote Sieve script management. Update to non-vulnerable version. --- Internal reference: DOV-8994 Type: CWE-400 (Uncontrolled Resource Consumption) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core =3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-04-02 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: ilyar@yeswehack CVE: CVE-2026-33605 CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Details: managesieve-login: Pre-auth crash. An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authenticating. Risk: If running in high-security mode (default for community releases), only the attacker's own connection is terminated. If running in high-performance mode (default for Pro releases), all connections handled by the same managesieve-login process are terminated. Repeating the attack can cause denial of service for Sieve script management. No publicly available exploits are known. Solution: Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. --- Internal reference: DOV-9039 Type: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot Pro core >=2.3.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5 First fixed revision: OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5 Discovery date: 2026-04-08 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: tipsennn@yeswehack CVE: CVE-2026-40018 CVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N) Details: MySQL multi-byte escaping wrong. None Risk: None No publicly available exploits are known. Solution: None --- Internal reference: DOV-9041 Type: CWE-400 (Uncontrolled Resource Consumption) Component: core Report confidence: Confirmed Solution status: Fixed by vendor Affected versions: OX Dovecot CE core >=2.4.3 <2.4.5 First fixed revision: OX Dovecot CE core 2.4.5 Discovery date: 2026-04-08 Solution date: 2026-08-26 Disclosure date: 2026-08-26 Researcher credits: ilyar@yeswehack CVE: CVE-2026-4
Severity
No CVSS data available.
Impacted products
Credits

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          "value": "Hi!\n\nWe\u0027re sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those \nvulnerabilities. This advisory will also be published at \nhttps://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0003.html\n\n---\n\nClassification: TLP:GREEN\n\nInternal reference: DOV-8476\nType: CWE-403 (Exposure of File Descriptor to Unintended Control Sphere (\u0027File Descriptor Leak\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2025-11-25\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nCVE: CVE-2026-33263\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nsubmission-login: Panic when mail_max_userip_connections is reached: Panic: epoll_ctl(del, 8) failed: Bad file \ndescriptor. When mail_max_userip_connections is set (defaul\nt 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues.\n\nRisk:\nIf running in high-security mode (default for community releases), only the new submission connection gets terminated. \nIf running in high-performance mode (default for Pr\no releases), all connections handled by the submission-login process will be terminated. The crashes can cause failure \nfor user to send a message, or it can cause duplica\nte messages to be sent. If TLS is not used (in the backend server processing the submission), duplicate deliveries \ncannot happen, because the crash can only happen at AUT\nH stage. No publicly available exploits are known.\n\nSolution:\nLimit the number of connections handled by single submission-login process. This has a performance impact though. \nUpdate to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8874\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c3.0.7, OX Dovecot Pro core \u003e=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \n\u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5\nDiscovery date: 2026-03-11\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ylwango613@yeswehack\nCVE: CVE-2026-33607\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nDovecot IMAP LIST match_sub() Exponential Backtracking \u2014 CPU Denial of Service. An attacker that has valid credentials \ncan use IMAP LIST command to consume CPU.\n\nRisk:\nThis can cause degradation or denial of service for IMAP. No publicly available exploits are known.\n\nSolution:\nMonitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed \nversion.\n\n\n\n---\n\n\n\nInternal reference: DOV-8884\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-13\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nCVE: CVE-2026-27852\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nDetails:\nDoS by sending mail with bad header. An attacker that can send mail to a user can craft a message whose headers contain \na very large number of email addresses or MIME par\nameters, which causes excessive memory usage when the message is later parsed.\n\nRisk:\nThe message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it, \ncausing denial of service for the affected user. No\n publicly available exploits are known.\n\nSolution:\nUpdate to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8941\nType: CWE-93 (Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: thanos_haruki@yeswehack\nCVE: CVE-2026-33606\nCVSS: 4.8 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N)\n\nDetails:\ndsync: Mail content can cause dsync protocol injection. Mail content stored by a user can be crafted so that it is \ninterpreted as dsync protocol commands when an administ\nrator later runs dsync with the stream protocol, for example during a migration.\n\nRisk:\nInjected commands can modify mailbox state on the destination during migration or replication, including internal \nmailbox attributes that a user should not be able to set\n directly. It can also cause dsync errors. No publicly available exploits are known.\n\nSolution:\nAvoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8947\nType: CWE-655 (Insufficient Psychological Acceptability)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: heckintosh@yeswehack\nCVE: CVE-2026-33604\nCVSS: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)\n\nDetails:\nSMTP Smuggling via Missing Dot-Stuffing After Bare Carriage Return. An attacker that can get Dovecot to relay a \nmessage, for example through Sieve redirect or submission \nrelay, can use a crafted line ending in the message body to bypass the outbound protection that prevents message \ncontent from being interpreted as SMTP commands.\n\nRisk:\nA downstream mail server that hasn\u0027t yet fixed the SMTP smuggling vulnerability can be tricked into treating part of \nthe message body as new SMTP commands, allowing injec\ntion of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. No publicly available \nexploits are known.\n\nSolution:\nWhere you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to \nnon-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8949\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: djvirus@yeswehack\nCVE: CVE-2026-40014\nCVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)\n\nDetails:\nIMAP THREAD REFERENCES O(N\u00b2) CPU DoS via Crafted References Header (index-thread-links.c). An attacker that can send \nmail to a user can craft a message header that makes \nthe IMAP THREAD command consume CPU disproportionate to the size of the message.\n\nRisk:\nWhen a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for \nIMAP. No publicly available exploits are known.\n\nSolution:\nMonitor system for abnormal CPU usage, kill the offending process and remove the offending message from the affected \nmailbox. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8991\nType: CWE-124 (Buffer Underwrite (\u0027Buffer Underflow\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-04-02\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-40013\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\npigeonhole: Stack Buffer Underflow in Pigeonhole ManageSieve CHECKSCRIPT/PUTSCRIPT. An attacker that has valid \ncredentials can submit a Sieve script containing an extreme\n numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script.\n\nRisk:\nThis causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for \nscript management. This might be able to be used for re\nmote code execution. No publicly available exploits are known.\n\nSolution:\nDisable the ManageSieve service if users do not need remote Sieve script management. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8994\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-04-02\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-33605\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nDetails:\nmanagesieve-login: Pre-auth crash. An unauthenticated attacker can crash the ManageSieve login process by sending a \nsmall malformed command before authenticating.\n\nRisk:\nIf running in high-security mode (default for community releases), only the attacker\u0027s own connection is terminated. If \nrunning in high-performance mode (default for Pro \nreleases), all connections handled by the same managesieve-login process are terminated. Repeating the attack can cause \ndenial of service for Sieve script management. No \npublicly available exploits are known.\n\nSolution:\nRestrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-9039\nType: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5\nDiscovery date: 2026-04-08\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: tipsennn@yeswehack\nCVE: CVE-2026-40018\nCVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)\n\nDetails:\nMySQL multi-byte escaping wrong. None\n\nRisk:\nNone No publicly available exploits are known.\n\nSolution:\nNone\n\n\n\n---\n\n\n\nInternal reference: DOV-9041\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot CE core \u003e=2.4.3 \u003c2.4.5\nFirst fixed revision: OX Dovecot CE core 2.4.5\nDiscovery date: 2026-04-08\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-4"
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CVE-2025-67735 (GCVE-0-2025-67735)

Vulnerability from cvelistv5 – Published: 2025-12-16 00:19 – Updated: 2025-12-16 14:26
VLAI
Title
Netty has a CRLF Injection vulnerability in io.netty.handler.codec.http.HttpRequestEncoder
Summary
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.129.Final and 4.2.8.Final, the `io.netty.handler.codec.http.HttpRequestEncoder` has a CRLF injection with the request URI when constructing a request. This leads to request smuggling when `HttpRequestEncoder` is used without proper sanitization of the URI. Any application / framework using `HttpRequestEncoder` can be subject to be abused to perform request smuggling using CRLF injection. Versions 4.1.129.Final and 4.2.8.Final fix the issue.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-16 14:26 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
References
Impacted products
Vendor Product Version
netty netty Affected: >= 4.2.0.Alpha1, < 4.2.8.Final
Affected: < 4.1.129.Final
Create a notification for this product.
Show details on NVD website

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CVE-2025-59419 (GCVE-0-2025-59419)

Vulnerability from cvelistv5 – Published: 2025-10-15 15:42 – Updated: 2025-10-17 19:44
VLAI
Title
Netty netty-codec-smtp SMTP Command Injection Vulnerability Allowing Email Forgery
Summary
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.128.Final and 4.2.7.Final, the SMTP codec in Netty contains an SMTP command injection vulnerability due to insufficient input validation for Carriage Return (\r) and Line Feed (\n) characters in user-supplied parameters. The vulnerability exists in io.netty.handler.codec.smtp.DefaultSmtpRequest, where parameters are directly concatenated into the SMTP command string without sanitization. When methods such as SmtpRequests.rcpt(recipient) are called with a malicious string containing CRLF sequences, attackers can inject arbitrary SMTP commands. Because the injected commands are sent from the server's trusted IP address, resulting emails will likely pass SPF and DKIM authentication checks, making them appear legitimate. This allows remote attackers who can control SMTP command parameters (such as email recipients) to forge arbitrary emails from the trusted server, potentially impersonating executives and forging high-stakes corporate communications. This issue has been patched in versions 4.1.129.Final and 4.2.8.Final. No known workarounds exist.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-15 17:21 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Impacted products
Vendor Product Version
netty netty Affected: < 4.2.7.Final
Affected: >= 4.2.0.Alpha1, < 4.1.128.Final
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Show details on NVD website

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CVE-2025-59151 (GCVE-0-2025-59151)

Vulnerability from cvelistv5 – Published: 2025-10-27 19:42 – Updated: 2025-10-27 20:24
VLAI
Title
Pi-hole Admin Interface vulnerable to HTTP response header injection via CRLF injection
Summary
Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level advertisement and internet tracker blocking application. Pi-hole Admin Interface before 6.3 is vulnerable to Carriage Return Line Feed (CRLF) injection. When a request is made to a file ending with the .lp extension, the application performs a redirect without properly sanitizing the input. An attacker can inject carriage return and line feed characters (%0d%0a) to manipulate both the headers and the content of the HTTP response. This enables the injection of arbitrary HTTP response headers, potentially leading to session fixation, cache poisoning, and the weakening or bypassing of browser-based security mechanisms such as Content Security Policy or X-XSS-Protection. This vulnerability is fixed in 6.3.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-27 20:23 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
  • CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
References
Impacted products
Vendor Product Version
pi-hole web Affected: < 6.3
Create a notification for this product.
Show details on NVD website

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CVE-2025-57804 (GCVE-0-2025-57804)

Vulnerability from cvelistv5 – Published: 2025-08-25 21:04 – Updated: 2025-11-03 18:13
VLAI
Title
h2 allows HTTP Request Smuggling due to illegal characters in headers
Summary
h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without properly validating header names/values, enabling attackers to manipulate request boundaries and bypass security controls. This issue has been patched in version 4.3.0.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-08-26 19:14 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Impacted products
Vendor Product Version
python-hyper h2 Affected: < 4.3.0
Create a notification for this product.
Show details on NVD website

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CVE-2025-54972 (GCVE-0-2025-54972)

Vulnerability from cvelistv5 – Published: 2025-11-18 17:01 – Updated: 2026-01-14 09:15
VLAI
Summary
An improper neutralization of crlf sequences ('crlf injection') vulnerability in Fortinet FortiMail 7.6.0 through 7.6.3, FortiMail 7.4.0 through 7.4.5, FortiMail 7.2 all versions, FortiMail 7.0 all versions may allow an attacker to inject headers in the response via convincing a user to click on a specifically crafted link
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-11-19 14:27 UTC
CWE
  • CWE-93 - Information disclosure
References
Impacted products
Vendor Product Version
Fortinet FortiMail Affected: 7.6.0 , ≤ 7.6.3 (semver)
Affected: 7.4.0 , ≤ 7.4.5 (semver)
Affected: 7.2.0 , ≤ 7.2.9 (semver)
Affected: 7.0.0 , ≤ 7.0.9 (semver)
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Create a notification for this product.
Show details on NVD website

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CVE-2025-53094 (GCVE-0-2025-53094)

Vulnerability from cvelistv5 – Published: 2025-06-27 19:57 – Updated: 2025-06-27 20:19
VLAI
Title
ESPAsyncWebServer Vulnerable to CRLF Injection in AsyncWebHeader.cpp
Summary
ESPAsyncWebServer is an asynchronous HTTP and WebSocket server library for ESP32, ESP8266, RP2040 and RP2350. In versions up to and including 3.7.8, a CRLF (Carriage Return Line Feed) injection vulnerability exists in the construction and output of HTTP headers within `AsyncWebHeader.cpp`. Unsanitized input allows attackers to inject CR (`\r`) or LF (`\n`) characters into header names or values, leading to arbitrary header or response manipulation. Manipulation of HTTP headers and responses can enable a wide range of attacks, making the severity of this vulnerability high. A fix is available at pull request 211 and is expected to be part of version 3.7.9.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-27 20:18 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
  • CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Impacted products
Show details on NVD website

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CVE-2025-52479 (GCVE-0-2025-52479)

Vulnerability from cvelistv5 – Published: 2025-06-25 16:06 – Updated: 2026-05-07 20:47
VLAI
Title
HTTP.jl vulnerable to CR/LF Injection in URIs
Summary
HTTP.jl provides HTTP client and server functionality for Julia, and URIs.jl parses and works with Uniform Resource Identifiers (URIs). URIs.jl prior to version 1.6.0 and HTTP.jl prior to version 1.10.17 allows the construction of URIs containing CR/LF characters. If user input was not otherwise escaped or protected, this can lead to a CRLF injection attack. Users of HTTP.jl should upgrade immediately to HTTP.jl v1.10.17, and users of URIs.jl should upgrade immediately to URIs.jl v1.6.0. The check for valid URIs is now in the URI.jl package, and the latest version of HTTP.jl incorporates that fix. As a workaround, manually validate any URIs before passing them on to functions in this package.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-26 19:52 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
  • CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Impacted products
Vendor Product Version
JuliaWeb HTTP.jl Affected: < 1.10.17
Create a notification for this product.
Show details on NVD website

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CVE-2025-48388 (GCVE-0-2025-48388)

Vulnerability from cvelistv5 – Published: 2025-05-29 09:16 – Updated: 2025-05-29 13:39
VLAI
Title
FreeScout Has Insufficient Protection Against CRLF-injection
Summary
FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.178, the application performs insufficient validation of user-supplied data, which is used as arguments to string formatting functions. As a result, an attacker can pass a string containing special symbols (\r, \n, \t)to the application. This issue has been patched in version 1.8.178.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-29 13:28 UTC
CWE
  • CWE-134 - Use of Externally-Controlled Format String
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
References
Impacted products
Show details on NVD website

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    "cveId": "CVE-2025-48388",
    "datePublished": "2025-05-29T09:16:25.163Z",
    "dateReserved": "2025-05-19T15:46:00.398Z",
    "dateUpdated": "2025-05-29T13:39:08.939Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Mitigation
Implementation

Avoid using CRLF as a special sequence.

Mitigation
Implementation

Appropriately filter or quote CRLF sequences in user-controlled input.

CAPEC-15: Command Delimiters

An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or denylist input validation, as opposed to allowlist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or denylist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.

CAPEC-81: Web Server Logs Tampering

Web Logs Tampering attacks involve an attacker injecting, deleting or otherwise tampering with the contents of web logs typically for the purposes of masking other malicious behavior. Additionally, writing malicious data to log files may target jobs, filters, reports, and other agents that process the logs in an asynchronous attack pattern. This pattern of attack is similar to "Log Injection-Tampering-Forging" except that in this case, the attack is targeting the logs of the web server and not the application.