CWE-400

{
  "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": "Dear subscribers,\n\nwe\u0027re sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those \nvulnerabilities. This advisory is also published at \nhttps://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0001.html\n\n\n---\n\n\nClassification: TLP:GREEN\n\nInternal reference: DOV-7830\nType: CWE-1250 (Improper Preservation of Consistency Between Independent Representations of Shared State)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot CE core 2.4.1\nDiscovery date: 2025-07-24\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: Erik  \u003cerik () broadlux com\u003e\nCVE: CVE-2025-30189\nCVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)\n\nDetails:\nv2.4 regression: auth cache broken with several passdb / userdb. When cache is enabled, some passdb/userdb drivers \nincorrectly cache all users with same cache key, causing wrong cached information to be used for these users.\n\nRisk:\nAfter cached login, all subsequent logins are for same user. No publicly available exploits are known.\n\nSolution:\nInstall fixed version or disable caching either globally or for the impacted passdb/userdb drivers.\n\n\n\n---\n\n\n\nInternal reference: DOV-8349\nType: CWE-20 (Improper Input Validation)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot Pro core 3.1.2, OX Dovecot CE core 2.4.3\nDiscovery date: 2025-11-04\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nCVE: CVE-2025-59028\nCVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nInvalid base64 authentication can cause DoS for other logins. When sending invalid base64 SASL data, login process is \ndisconnected from the auth server, causing all active authentication sessions to fail.\n\nRisk:\nInvalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. No publicly available exploits \nare known.\n\nSolution:\nInstall fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments).\n\n\n\n---\n\n\n\nInternal reference: DOV-8508\nType: CWE-20 (Improper Input Validation)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.3\nDiscovery date: 2025-11-29\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nCVE: CVE-2025-59032\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nDetails:\nv2.4/v3.1 regression: Pigeonhole: ManageSieve panic occurs with sieve-connect as a client. ManageSieve AUTHENTICATE \ncommand crashes when using literal as SASL initial response.\n\nRisk:\nThis can be used to crash ManageSieve service repeatedly, making it unavailable for other users. No publicly available \nexploits are known.\n\nSolution:\nControl access to ManageSieve port, or disable the service if it\u0027s not needed. Alternatively upgrade to a fixed version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8584\nType: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 2.3.0\nFirst fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.3, OX Dovecot Pro core 2.3.22.1\nDiscovery date: 2025-12-29\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: cavid@yeswehack\nCVE: CVE-2025-59031\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)\n\nDetails:\ndecode2text.sh OOXML extraction may follow symlinks and read unintended files during indexing. Dovecot has provided a \nscript to use for attachment to text conversion. This script unsafely handles zip-style attachments.\n\nRisk:\nAttacker can use specially crafted OOXML documents to cause unintended files on the system to be indexed and \nsubsequently ending up in FTS indexes. No publicly available exploits are known.\n\nSolution:\nDo not use the provided script, instead, use something else like FTS tika.\n\n\n\n---\n\n\n\nInternal reference: DOV-8591\nType: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 2.3.0\nFirst fixed revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nDiscovery date: 2026-01-07\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: strokep@yeswehack\nCVE: CVE-2026-0394\nCVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)\n\nDetails:\nauth: Path traversal in passwd-file passdb using `%d` (domain) escapes base directory and opens `/etc/passwd`Pre-auth \npath traversal in passwd-file passdb using `%d` (domain) escapes base directory and opens `/etc/passwd`. When dovecot \nhas been configured to use per-domain passwd files, and they are placed one path component above /etc, or slash has \nbeen added to allowed characters, path traversal can happen if the domain component is directory partial.\n\nRisk:\nThis allows inadvertently reading /etc/passwd (or some other path which ends with passwd). If this file contains \npasswords, it can be used to authenticate wrongly, or if this is userdb, it can unexpectly make system users appear \nvalid users.  No publicly available exploits are known.\n\nSolution:\nUpgrade to fixed version, or use different authentication scheme that does not rely on paths. Alternatively you can \nalso ensure that the per-domain passwd files are in some other location, such as /etc/dovecot/auth/%d.\n\n\n\n---\n\n\n\nInternal reference: DOV-8775\nType: CWE-90 (Improper Neutralization of Special Elements used in an LDAP Query (\u0027LDAP Injection\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4\nDiscovery date: 2026-02-20\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: cookiejack15@yeswehack\nCVE: CVE-2026-27860\nCVSS: 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)\n\nDetails:\nv2.4/v3.1 regression: auth-ldap is not escaping usernames. If auth_username_chars is empty, it is possible to inject \narbitrary LDAP filter to Dovecot\u0027s LDAP authentication.\n\nRisk:\nThis leads to potentially bypassing restrictions and allows probing of LDAP structure. No publicly available exploits \nare known.\n\nSolution:\nDo not clear out auth_username_chars, or install fixed version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8781\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\nLast affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4\nDiscovery date: 2026-02-23\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: whisperer@yeswehack\nCVE: CVE-2026-24031\nCVSS: 7.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L)\n\nDetails:\nv2.4/v3.1 regression: SQL injection allows bypassing authentication. Dovecot SQL based authentication can be bypassed \nwhen auth_username_chars is cleared by admin.\n\nRisk:\nThis vulnerability allows bypassing authentication for any user and user enumeration. No publicly available exploits \nare known.\n\nSolution:\nDo not clear auth_username_chars. If this is not possible, install latest fixed version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8787\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 3.0.2, OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4\nDiscovery date: 2026-02-24\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: djvirus@yeswehack\nCVE: CVE-2026-27859\nCVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nv3.0.2+ regression: Message headers MIME parameter parsing can cause excessive CPU usage. A mail message containing \nexcessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU.\n\nRisk:\nA suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. No publicly \navailable exploits are known.\n\nSolution:\nUse MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the \nprocessing is limited.\n\n\n\n---\n\n\n\nInternal reference: DOV-8816\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 2.3.0\nFirst fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4, OX Dovecot Pro \ncore 2.3.22.1\nDiscovery date: 2026-02-27\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: whisperer@yeswehack\nCVE: CVE-2026-27857\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nimap-login: Excessive memory usage DoS. Sending \"NOOP (((...)))\" command with 4000 parenthesis open+close results in \n~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for \nlonger time periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and \ncreate 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the \nprocess and its other proxied connections.\n\nRisk:\nAttacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which \nwould likely result in reaching VSZ limit and killing the process and its other proxied connections. No publicly \navailable exploits are known.\n\nSolution:\nInstall fixed version, there is no other remediation.\n\n\n\n---\n\n\n\nInternal reference: DOV-8818\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 2.3.0, OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4, OX Dovecot Pro \ncore 2.3.22.1\nDiscovery date: 2026-02-28\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-27858\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 out-of-memory DoS. Attacker can send a specifically crafted message before authentication that causes \nmanagesieve to allocate large amount of memory.\n\n\nRisk:\nAttacker can force managesieve-login to be unavailable by repeatedly crashing the process. No publicly available \nexploits are known.\n\nSolution:\nProtect access to managesieve protocol, or install fixed version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8830\nType: CWE-287 (Improper Authentication)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 2.3.0\nFirst fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4, OX Dovecot Pro \ncore 2.3.22.1\nDiscovery date: 2026-03-04\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: bksparajuli@yeswehack\nCVE: CVE-2026-27856\nCVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)\n\nDetails:\ndoveadm: Credentials verified without timing safety. Doveadm credentials are verified using direct comparison which is \nsusceptible to timing oracle attack. An attacker can use this to determine the configured credentials.\n\nRisk:\nFiguring out the credential will le"
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        "discovery": "EXTERNAL"
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "Nmap",
          "vendor": "Nmap",
          "versions": [
            {
              "status": "affected",
              "version": "unknown"
            }
          ]
        }
      ],
      "credits": [
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          "lang": "en",
          "type": "finder",
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          "value": "----------------------------------------------------------------------------\nNotCVE Advisory \u2014 NotCVE-2026-0011\n----------------------------------------------------------------------------\n\n[-] Summary:\nNmap 7.99 and earlier contain a loop with an unreachable exit condition in\nthe Packet:parse_options() method of nselib/packet.lua. A remote host that\nis the target of a scan can exhaust the memory of the scanning Nmap process\nand terminate it by replying with a packet that carries a zero-length header\noption. No authentication and no access to the scanning machine are\nrequired: the attacker only needs to be scanned.\nCVSS:3.1 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).\n\n[-] Affected:\nNmap, versions 7.99 and earlier (nselib/packet.lua).\nFixed in commit 7ef4ee0 (2026-06-11). That fix sits above the topmost\nrelease header in the CHANGELOG (Nmap 7.99 [2026-03-26]), so as of this\nwriting it is present only in the development tree and no released version\ncarrying it has been verified.\n\n[-] Technical Description:\nPacket:parse_options(offset, length) walks the option area with a cursor,\nopt_ptr, reading an option type t and, for any type other than 0 (End of\nOption List) or 1 (No-Operation), a length byte l taken from\nself:u8(offset + opt_ptr + 1). The cursor is then advanced by\nopt_ptr = opt_ptr + l.\n\nBefore commit 7ef4ee0 the parser accepted l == 0 without validation, so the\ncursor never advanced and the \"while opt_ptr \u003c length\" condition never\nbecame false. Because the loop body allocated a fresh table with\noptions[op] = {} and incremented op on every pass, the non-terminating loop\nalso grew a table without bound, and the Lua interpreter embedded in Nmap\nconsumed memory until the process died. The options[op] = {} assignment was\npositioned before the length was validated, which is why the loop allocated\nrather than merely spinning.\n\nThe method is reached from tcp_parse(), where the option area length derives\nfrom the TCP data offset field of the received packet. A remote peer\ntherefore controls both the length of the option area and its contents.\nnselib/packet.lua is the packet-dissection library used by NSE scripts that\ncapture and parse raw packets, so exploitation requires the operator to run\na scan that loads such a script against a host the attacker controls.\n\nNothing is persisted and the effect ends with the process, but the attacker\ncan repeat it on every subsequent scan, so the host remains effectively\nunscannable by any script using this library.\n\nCommit 7ef4ee0 (\"Stop parsing on a zero-length packet option\") adds an\n\"if l==0 then break end\" guard before any allocation and moves the\noptions[op] = {} initialisation to after that check. The CHANGELOG entry\nreads \"[NSE][GH#3368] Fixed an out-of-memory issue in packet.lua when\nparsing a zero-length TCP header option.\"\n\nThe step-by-step attack path, the reachability analysis of the IP options\ncode path and the full write-up are published at the advisory URL below.\n\nWeaknesses:\nCWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)\nCWE-400: Uncontrolled Resource Consumption\nCWE-770: Allocation of Resources Without Limits or Throttling\nCAPEC-130: Excessive Allocation\n\n[-] Timeline:\n[28/07/2026] - NotCVE ID reserved.\n[28/07/2026] - Published as NotCVE-2026-0011.\n\n[-] Credit:\nDiscovered by Maxim Suhanov (@errno_fail).\n\n[-] Full Details and Updates:\nhttps://notcve.org/notcve/NotCVE-2026-0011\n\n[-] References:\nhttps://github.com/nmap/nmap/issues/3368\nhttps://github.com/nmap/nmap/commit/7ef4ee030a0023fe22616387a000032e1a678b6a\nhttps://github.com/nmap/nmap/pull/3373\nhttps://raw.githubusercontent.com/nmap/nmap/master/nselib/packet.lua\nhttps://raw.githubusercontent.com/nmap/nmap/master/CHANGELOG\n\n[-] About NotCVE:\nNotCVE (https://notcve.org) assigns public, timestamped NotCVE IDs to\nvulnerabilities not acknowledged by vendors. Vendor will not assign a CVE?\nRequest a NotCVE: https://notcve.org/form/ \u00b7 Contributors:\nhttps://notcve.org/hall/\n_______________________________________________\nSent through the Full Disclosure mailing list\nhttps://nmap.org/mailman/listinfo/fulldisclosure\nWeb Archives \u0026 RSS: https://seclists.org/fulldisclosure/"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400",
              "lang": "en",
              "type": "CWE"
            },
            {
              "cweId": "CWE-770",
              "description": "CWE-770",
              "lang": "en",
              "type": "CWE"
            },
            {
              "cweId": "CWE-835",
              "description": "CWE-835",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T08:13:27Z",
        "orgId": "4e2abfbf-4a2a-4b76-a4e0-d77c18ba156c",
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      },
      "references": [
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://vuln.freearchive.org/archive/full-disclosure/2026/Aug/112"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://seclists.org/fulldisclosure/2026/Aug/112"
        },
        {
          "url": "https://github.com/nmap/nmap/commit/7ef4ee030a0023fe22616387a000032e1a678b6a"
        },
        {
          "url": "https://github.com/nmap/nmap/issues/3368"
        },
        {
          "url": "https://github.com/nmap/nmap/pull/3373"
        },
        {
          "url": "https://nmap.org/mailman/listinfo/fulldisclosure"
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          "vendor": "Dovecot",
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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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