RHSA-2026:76763
Vulnerability from csaf_redhat - Published: 2026-10-06 17:18 - Updated: 2026-10-06 23:33Summary
Red Hat Security Advisory: dovecot security, bug fix, and enhancement update
Severity
Important
Notes
Topic: An update for dovecot is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages.
Security Fix(es):
* dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters (CVE-2026-42391)
* dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation (CVE-2026-73208)
* dovecot: Dovecot: Denial of service via crafted email headers (CVE-2026-27852)
* dovecot: Dovecot: Denial of Service via truncated quoted argument in ManageSieve (CVE-2026-40019)
* dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion (CVE-2026-33263)
* dovecot: Dovecot: Denial of Service in ManageSieve login process (CVE-2026-33605)
* dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free (CVE-2026-42007)
* dovecot: Dovecot: MySQL multi-byte escaping wrong (CVE-2026-40018)
Bug Fix(es) and Enhancement(s):
* Dovecot crashes when accessing mailbox with: "Panic: file mail-user.c: line 229 (mail_user_deinit): assertion failed: ((*user)->refcount == 1)" (JIRA:RHEL-176273)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in dovecot. A remote attacker can craft a malicious email with an excessive number of email addresses or MIME parameters in its headers. When a user attempts to read this message over IMAP, the parsing process consumes an inordinate amount of memory, leading to the termination of the process. This can result in a denial of service for the affected user.
7.5 (High)
Affected products
Fixed
68 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-1:2.3.16-16.el8_10.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-debuginfo-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-debuginfo-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-debuginfo-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-debuginfo-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-debugsource-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-debugsource-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-debugsource-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-debugsource-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-mysql-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-mysql-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-mysql-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-mysql-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-mysql-debuginfo-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-mysql-debuginfo-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-mysql-debuginfo-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-mysql-debuginfo-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pgsql-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pgsql-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pgsql-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pgsql-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pgsql-debuginfo-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pgsql-debuginfo-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pgsql-debuginfo-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pgsql-debuginfo-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-1:2.3.16-16.el8_10.x86_64 | — |
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fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-debuginfo-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-debuginfo-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-debuginfo-1:2.3.16-16.el8_10.s390x | — |
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fix
Workaround
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|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-debuginfo-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-1:2.3.16-16.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-debuginfo-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-debuginfo-1:2.3.16-16.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-debuginfo-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-debuginfo-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-debuginfo-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-debugsource-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-debugsource-1:2.3.16-16.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-debugsource-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-debugsource-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-debugsource-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-devel-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-devel-1:2.3.16-16.el8_10.i686 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-devel-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-devel-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-devel-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-mysql-debuginfo-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-mysql-debuginfo-1:2.3.16-16.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-mysql-debuginfo-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-mysql-debuginfo-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-mysql-debuginfo-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-pgsql-debuginfo-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-pgsql-debuginfo-1:2.3.16-16.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-pgsql-debuginfo-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-pgsql-debuginfo-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-pgsql-debuginfo-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-debuginfo-1:2.3.16-16.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-debuginfo-1:2.3.16-16.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-debuginfo-1:2.3.16-16.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-debuginfo-1:2.3.16-16.el8_10.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:dovecot-pigeonhole-debuginfo-1:2.3.16-16.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
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Threats
Impact
Important
A flaw was found in the Dovecot mail server's `submission-login` component. This vulnerability occurs when the server reaches its maximum allowed user IP connections, leading to a crash due to file descriptor handling issues. This can result in a denial of service, preventing users from sending emails, and potentially causing duplicate message delivery under certain conditions.
7.1 (High)
Affected products
Fixed
68 products, the same list as for
CVE-2026-27852
Threats
Impact
Important
A flaw was found in Dovecot. An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authenticating. This can lead to a denial of service for Sieve script management, affecting either the attacker's connection or all connections handled by the same process, depending on the security mode.
7.5 (High)
Affected products
Fixed
68 products, the same list as for
CVE-2026-27852
Threats
Impact
Important
A flaw was found in Dovecot. A remote attacker with high attack complexity could exploit this vulnerability to gain access to sensitive information and modify data without requiring any user interaction or privileges.
7.4 (High)
Affected products
Fixed
68 products, the same list as for
CVE-2026-27852
Threats
Impact
Important
A flaw was found in Dovecot's ManageSieve login process. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted, truncated quoted argument. This action causes the process to enter an infinite loop, consuming excessive CPU resources. Repeated exploitation can lead to a denial of service, impacting Sieve script management and overall server availability.
7.5 (High)
Affected products
Fixed
68 products, the same list as for
CVE-2026-27852
Threats
Impact
Important
A flaw was found in Dovecot. An authenticated attacker can use a Sieve script with the `editheader` extension to trigger a use-after-free vulnerability in the mail editing code. This can lead to memory corruption, potentially crashing the mail delivery process and allowing for arbitrary code execution in the context of that process.
9.1 (Critical)
Affected products
Fixed
68 products, the same list as for
CVE-2026-27852
Threats
Impact
Important
A flaw was found in Dovecot. An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in. This action causes the server to consume excessive memory and CPU resources, leading to the termination of login processes and other active connections. This can result in a degradation or complete denial of service for IMAP logins.
7.5 (High)
Affected products
Fixed
68 products, the same list as for
CVE-2026-27852
Threats
Impact
Important
A flaw was found in Dovecot. This vulnerability allows an attacker to bypass authentication by exploiting how OAuth2 tokens are validated. If an OAuth2 token response does not include a scope claim, Dovecot incorrectly uses the audience claim in its place for authorization checks. This can lead to unauthorized access, as a token with no relevant permissions might be accepted if its intended recipient value matches a configured scope name.
7.4 (High)
Affected products
Fixed
68 products, the same list as for
CVE-2026-27852
Threats
Impact
Important
References
45 references
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"title": "Vulnerability description"
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"text": "dovecot: Dovecot: Denial of service via crafted email headers",
"title": "Vulnerability summary"
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{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-27852"
},
{
"category": "external",
"summary": "RHBZ#2525557",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525557"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-27852",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-27852"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-27852",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27852"
},
{
"category": "external",
"summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json",
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json"
}
],
"release_date": "2026-08-28T10:12:11.070000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-06T17:18:42+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"title": "dovecot: Dovecot: Denial of service via crafted email headers"
},
{
"cve": "CVE-2026-33263",
"cwe": {
"id": "CWE-910",
"name": "Use of Expired File Descriptor"
},
"discovery_date": "2026-08-28T11:22:55.051900+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2525567"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Dovecot mail server\u0027s `submission-login` component. This vulnerability occurs when the server reaches its maximum allowed user IP connections, leading to a crash due to file descriptor handling issues. This can result in a denial of service, preventing users from sending emails, and potentially causing duplicate message delivery under certain conditions.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"url": "https://access.redhat.com/security/cve/CVE-2026-33263"
},
{
"category": "external",
"summary": "RHBZ#2525567",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525567"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-33263",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-33263"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33263",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33263"
},
{
"category": "external",
"summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json",
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json"
}
],
"release_date": "2026-08-28T10:12:12.032000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-06T17:18:42+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H",
"version": "3.1"
},
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{
"category": "impact",
"details": "Important"
}
],
"title": "dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion"
},
{
"cve": "CVE-2026-33605",
"cwe": {
"id": "CWE-1286",
"name": "Improper Validation of Syntactic Correctness of Input"
},
"discovery_date": "2026-08-28T11:23:21.216021+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2525576"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Dovecot. An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authenticating. This can lead to a denial of service for Sieve script management, affecting either the attacker\u0027s connection or all connections handled by the same process, depending on the security mode.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dovecot: Dovecot: Denial of Service in ManageSieve login process",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"url": "https://access.redhat.com/security/cve/CVE-2026-33605"
},
{
"category": "external",
"summary": "RHBZ#2525576",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525576"
},
{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-33605"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33605",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33605"
},
{
"category": "external",
"summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json",
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json"
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{
"category": "vendor_fix",
"date": "2026-10-06T17:18:42+00:00",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:76763"
},
{
"category": "workaround",
"details": "Restrict network access to the ManageSieve service to trusted clients only. This can be achieved by configuring a firewall to limit incoming connections to the service\u0027s port (e.g., 4190 for Sieve) from specific IP addresses or networks. For example, using `firewalld`:\n\n```bash\nfirewall-cmd --permanent --add-rich-rule=\u0027rule family=\"ipv4\" source address=\"\u003cTRUSTED_IP_OR_NETWORK\u003e\" port port=\"4190\" protocol=\"tcp\" accept\u0027\nfirewall-cmd --reload\n```\n\nReplace `\u003cTRUSTED_IP_OR_NETWORK\u003e` with the actual trusted source. A firewall reload is required for changes to take effect.",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"title": "dovecot: Dovecot: Denial of Service in ManageSieve login process"
},
{
"cve": "CVE-2026-40018",
"cwe": {
"id": "CWE-89",
"name": "Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027)"
},
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2525584"
}
],
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{
"category": "description",
"text": "A flaw was found in Dovecot. A remote attacker with high attack complexity could exploit this vulnerability to gain access to sensitive information and modify data without requiring any user interaction or privileges.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dovecot: Dovecot: MySQL multi-byte escaping wrong",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
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"title": "dovecot: Dovecot: MySQL multi-byte escaping wrong"
},
{
"cve": "CVE-2026-40019",
"cwe": {
"id": "CWE-835",
"name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
},
"discovery_date": "2026-08-28T11:22:22.707193+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2525559"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Dovecot\u0027s ManageSieve login process. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted, truncated quoted argument. This action causes the process to enter an infinite loop, consuming excessive CPU resources. Repeated exploitation can lead to a denial of service, impacting Sieve script management and overall server availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dovecot: Dovecot: Denial of Service via truncated quoted argument in ManageSieve",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-40019"
},
{
"category": "external",
"summary": "RHBZ#2525559",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525559"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-40019",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-40019"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-40019",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40019"
},
{
"category": "external",
"summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json",
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json"
}
],
"release_date": "2026-08-28T10:12:21.390000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-06T17:18:42+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"title": "dovecot: Dovecot: Denial of Service via truncated quoted argument in ManageSieve"
},
{
"cve": "CVE-2026-42007",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-08-28T11:23:52.623739+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2525583"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Dovecot. An authenticated attacker can use a Sieve script with the `editheader` extension to trigger a use-after-free vulnerability in the mail editing code. This can lead to memory corruption, potentially crashing the mail delivery process and allowing for arbitrary code execution in the context of that process.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw requires an attacker to authenticate with valid credentials before it can be exploited, and exploitation additionally depends on the Sieve `editheader` extension being enabled, which is not Dovecot\u0027s default configuration. Because the CVSS attack vector requires low-privileged authentication (PR:L) rather than unauthenticated remote access, and the confirmed impact is primarily memory corruption leading to a crash of the mail delivery process, this issue is rated Important rather than Critical. Disabling the Sieve `editheader` extension fully mitigates the vulnerability without requiring a package update.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42007"
},
{
"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525583"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42007",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42007"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42007",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42007"
},
{
"category": "external",
"summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json",
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json"
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"release_date": "2026-08-28T10:12:25.136000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-06T17:18:42+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"url": "https://access.redhat.com/errata/RHSA-2026:76763"
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"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H",
"version": "3.1"
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"category": "impact",
"details": "Important"
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],
"title": "dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free"
},
{
"cve": "CVE-2026-42391",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2026-08-28T11:21:42.115827+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2525545"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Dovecot. An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in. This action causes the server to consume excessive memory and CPU resources, leading to the termination of login processes and other active connections. This can result in a degradation or complete denial of service for IMAP logins.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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},
{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-42391"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42391",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42391"
},
{
"category": "external",
"summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json",
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"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:76763"
},
{
"category": "workaround",
"details": "To mitigate this issue, limit the number of connections handled by a single `imap-login` process by adjusting the `process_limit` setting within the `service imap-login` block in your Dovecot configuration (e.g., `/etc/dovecot/dovecot.conf`). Increasing `process_limit` will cause Dovecot to spawn more `imap-login` processes, distributing connections more widely and reducing the impact of a single malicious connection.\n\nFor example, to set the process limit to 200:\n\n```\n# /etc/dovecot/dovecot.conf\nservice imap-login {\n process_limit = 200\n}\n```\n\nAfter modifying the configuration, restart the Dovecot service for the changes to take effect. This may impact performance due to increased process overhead.\n\n```bash\nsystemctl restart dovecot\n```",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters"
},
{
"cve": "CVE-2026-73208",
"cwe": {
"id": "CWE-303",
"name": "Incorrect Implementation of Authentication Algorithm"
},
"discovery_date": "2026-08-28T11:21:47.923416+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2525547"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Dovecot. This vulnerability allows an attacker to bypass authentication by exploiting how OAuth2 tokens are validated. If an OAuth2 token response does not include a scope claim, Dovecot incorrectly uses the audience claim in its place for authorization checks. This can lead to unauthorized access, as a token with no relevant permissions might be accepted if its intended recipient value matches a configured scope name.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-73208"
},
{
"category": "external",
"summary": "RHBZ#2525547",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525547"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-73208",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-73208"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-73208",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73208"
},
{
"category": "external",
"summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json",
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json"
}
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"release_date": "2026-08-28T10:12:32.679000+00:00",
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{
"category": "vendor_fix",
"date": "2026-10-06T17:18:42+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"url": "https://access.redhat.com/errata/RHSA-2026:76763"
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation"
}
]
}
Loading…
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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