Vulnerability-Lookup

RHSA-2026:79371

Vulnerability from csaf_opensuse - Published: 2026-10-08 18:12 - Updated: 2026-10-12 20:22

Summary

Red Hat Security Advisory: dovecot security update

Severity

Important

Notes

Topic: An update for dovecot is now available for Red Hat Enterprise Linux 10. 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) 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.

CVE-2026-27852

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)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Fixed 61 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z:dovecot-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-1:2.3.21-19.el10_2.8.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-debuginfo-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-debuginfo-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-debuginfo-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-debuginfo-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-debugsource-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-debugsource-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-debugsource-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-debugsource-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-mysql-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-mysql-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-mysql-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-mysql-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-mysql-debuginfo-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-mysql-debuginfo-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-mysql-debuginfo-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-mysql-debuginfo-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pgsql-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pgsql-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pgsql-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pgsql-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pgsql-debuginfo-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pgsql-debuginfo-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pgsql-debuginfo-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pgsql-debuginfo-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pigeonhole-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pigeonhole-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pigeonhole-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pigeonhole-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pigeonhole-debuginfo-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pigeonhole-debuginfo-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pigeonhole-debuginfo-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:dovecot-pigeonhole-debuginfo-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-debuginfo-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-debuginfo-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-debuginfo-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-debuginfo-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-debugsource-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-debugsource-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-debugsource-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-debugsource-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-devel-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-devel-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-devel-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-devel-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-mysql-debuginfo-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-mysql-debuginfo-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-mysql-debuginfo-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-mysql-debuginfo-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-pgsql-debuginfo-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-pgsql-debuginfo-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-pgsql-debuginfo-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-pgsql-debuginfo-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-pigeonhole-debuginfo-1:2.3.21-19.el10_2.8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-pigeonhole-debuginfo-1:2.3.21-19.el10_2.8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-pigeonhole-debuginfo-1:2.3.21-19.el10_2.8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: CRB-10.2.Z:dovecot-pigeonhole-debuginfo-1:2.3.21-19.el10_2.8.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

CVE-2026-33263

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)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

CWE-910 - Use of Expired File Descriptor

Affected products

Fixed 61 products, the same list as for CVE-2026-27852

Threats

Impact Important

CVE-2026-33605

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)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-1286 - Improper Validation of Syntactic Correctness of Input

Affected products

Fixed 61 products, the same list as for CVE-2026-27852

Threats

Impact Important

CVE-2026-40018

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)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Affected products

Fixed 61 products, the same list as for CVE-2026-27852

Threats

Impact Important

CVE-2026-40019

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)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Affected products

Fixed 61 products, the same list as for CVE-2026-27852

Threats

Impact Important

CVE-2026-42007

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)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

CWE-825 - Expired Pointer Dereference

Affected products

Fixed 61 products, the same list as for CVE-2026-27852

Threats

Impact Important

CVE-2026-42391

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)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Fixed 61 products, the same list as for CVE-2026-27852

Threats

Impact Important

CVE-2026-73208

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)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE-303 - Incorrect Implementation of Authentication Algorithm

Affected products

Fixed 61 products, the same list as for CVE-2026-27852

Threats

Impact Important

References

44 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:79371	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2525545	external
https://bugzilla.redhat.com/show_bug.cgi?id=2525547	external
https://bugzilla.redhat.com/show_bug.cgi?id=2525557	external
https://bugzilla.redhat.com/show_bug.cgi?id=2525559	external
https://bugzilla.redhat.com/show_bug.cgi?id=2525567	external
https://bugzilla.redhat.com/show_bug.cgi?id=2525576	external
https://bugzilla.redhat.com/show_bug.cgi?id=2525583	external
https://bugzilla.redhat.com/show_bug.cgi?id=2525584	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-27852	self
https://bugzilla.redhat.com/show_bug.cgi?id=2525557	external
https://www.cve.org/CVERecord?id=CVE-2026-27852	external
https://nvd.nist.gov/vuln/detail/CVE-2026-27852	external
https://documentation.open-xchange.com/dovecot/se…	external
https://access.redhat.com/security/cve/CVE-2026-33263	self
https://bugzilla.redhat.com/show_bug.cgi?id=2525567	external
https://www.cve.org/CVERecord?id=CVE-2026-33263	external
https://nvd.nist.gov/vuln/detail/CVE-2026-33263	external
https://access.redhat.com/security/cve/CVE-2026-33605	self
https://bugzilla.redhat.com/show_bug.cgi?id=2525576	external
https://www.cve.org/CVERecord?id=CVE-2026-33605	external
https://nvd.nist.gov/vuln/detail/CVE-2026-33605	external
https://access.redhat.com/security/cve/CVE-2026-40018	self
https://bugzilla.redhat.com/show_bug.cgi?id=2525584	external
https://www.cve.org/CVERecord?id=CVE-2026-40018	external
https://nvd.nist.gov/vuln/detail/CVE-2026-40018	external
https://access.redhat.com/security/cve/CVE-2026-40019	self
https://bugzilla.redhat.com/show_bug.cgi?id=2525559	external
https://www.cve.org/CVERecord?id=CVE-2026-40019	external
https://nvd.nist.gov/vuln/detail/CVE-2026-40019	external
https://access.redhat.com/security/cve/CVE-2026-42007	self
https://bugzilla.redhat.com/show_bug.cgi?id=2525583	external
https://www.cve.org/CVERecord?id=CVE-2026-42007	external
https://nvd.nist.gov/vuln/detail/CVE-2026-42007	external
https://access.redhat.com/security/cve/CVE-2026-42391	self
https://bugzilla.redhat.com/show_bug.cgi?id=2525545	external
https://www.cve.org/CVERecord?id=CVE-2026-42391	external
https://nvd.nist.gov/vuln/detail/CVE-2026-42391	external
https://access.redhat.com/security/cve/CVE-2026-73208	self
https://bugzilla.redhat.com/show_bug.cgi?id=2525547	external
https://www.cve.org/CVERecord?id=CVE-2026-73208	external
https://nvd.nist.gov/vuln/detail/CVE-2026-73208	external

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          "text": "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.",
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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.",
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          "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"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-27852",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-27852"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-27852",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27852"
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        {
          "category": "external",
          "summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json",
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            "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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        {
          "category": "impact",
          "details": "Important"
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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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          "category": "external",
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          "url": "https://www.cve.org/CVERecord?id=CVE-2026-33263"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33263",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33263"
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        {
          "category": "external",
          "summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json",
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            "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",
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      "title": "dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion"
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    {
      "cve": "CVE-2026-33605",
      "cwe": {
        "id": "CWE-1286",
        "name": "Improper Validation of Syntactic Correctness of Input"
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      "ids": [
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        {
          "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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          "date": "2026-10-08T18:12:18+00:00",
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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",
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      "title": "dovecot: Dovecot: Denial of Service in ManageSieve login process"
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    {
      "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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      "discovery_date": "2026-08-28T11:23:55.441419+00:00",
      "ids": [
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          "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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          "category": "external",
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40018"
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          "category": "external",
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            "integrityImpact": "HIGH",
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      "title": "dovecot: Dovecot: MySQL multi-byte escaping wrong"
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      "cve": "CVE-2026-40019",
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        "id": "CWE-835",
        "name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
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          "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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          "url": "https://www.cve.org/CVERecord?id=CVE-2026-40019"
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          "category": "external",
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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "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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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-42007"
        },
        {
          "category": "external",
          "summary": "RHBZ#2525583",
          "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": [
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          "category": "vendor_fix",
          "date": "2026-10-08T18:12:18+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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      "title": "dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free"
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    {
      "cve": "CVE-2026-42391",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
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          "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.",
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          "category": "external",
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          "url": "https://www.cve.org/CVERecord?id=CVE-2026-42391"
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          "category": "external",
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            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:79371"
        },
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          "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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            "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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      "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"
        }
      ],
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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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            "CRB-10.2.Z:dovecot-pigeonhole-debuginfo-1:2.3.21-19.el10_2.8.x86_64"
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        }
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          "cvss_v3": {
            "attackComplexity": "HIGH",
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            "CRB-10.2.Z:dovecot-pigeonhole-debuginfo-1:2.3.21-19.el10_2.8.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation"
    }
  ]
}

CVE-2026-27852 (GCVE-0-2026-27852)

Vulnerability from cvelistv5 – Published: 2026-08-28 10:12 – Updated: 2026-08-28 15:55

Summary

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 parameters, which causes excessive memory usage when the message is later parsed. 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. Update to non-vulnerable version. No publicly available exploits are known.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 14:42 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

OX CNA under the mitre root

CNA scorecard C 61/100 over 74 records in the last 180 days details

References

1 reference

URL	Tags
https://documentation.open-xchange.com/dovecot/se…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
Open-Xchange GmbH	OX Dovecot Pro	Affected: 2.3.0 , < 2.3.22.2 (semver) Affected: 3.0.0 , < 3.0.7 (semver) Affected: 3.1.0 , < 3.1.6 (semver)
Open-Xchange GmbH	OX Dovecot CE	Affected: 2.3.0 , < 2.4.5 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
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              "content": {
                "id": "CVE-2026-27852",
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          "cvssV3_1": {
            "attackComplexity": "LOW",
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CVE-2026-33263 (GCVE-0-2026-33263)

Vulnerability from cvelistv5 – Published: 2026-08-28 10:12 – Updated: 2026-08-28 15:55

Summary

When mail_max_userip_connections is set (default 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues. 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 Pro 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 duplicate 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 AUTH stage. Limit the number of connections handled by single submission-login process. This has a performance impact though. Update to non-vulnerable version. No publicly available exploits are known.

Severity

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 14:32 UTC

CWE

CWE-403 - Exposure of File Descriptor to Unintended Control Sphere ('File Descriptor Leak')

Assigner

OX CNA under the mitre root

CNA scorecard C 61/100 over 74 records in the last 180 days details

References

1 reference

URL	Tags
https://documentation.open-xchange.com/dovecot/se…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
Open-Xchange GmbH	OX Dovecot Pro	Affected: 2.3.0 , < 2.3.22.2 (semver) Affected: 3.0.0 , < 3.0.7 (semver) Affected: 3.1.0 , < 3.1.6 (semver)
Open-Xchange GmbH	OX Dovecot CE	Affected: 2.3.0 , < 2.4.5 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
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              "content": {
                "id": "CVE-2026-33263",
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      ],
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        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
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      ],
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        "defect": "DOV-8476",
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    "datePublished": "2026-08-28T10:12:12.032Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

CVE-2026-33605 (GCVE-0-2026-33605)

Vulnerability from cvelistv5 – Published: 2026-08-28 10:12 – Updated: 2026-08-28 15:55

Summary

An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authenticating. 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. Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 14:42 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

OX CNA under the mitre root

CNA scorecard C 61/100 over 74 records in the last 180 days details

References

1 reference

URL	Tags
https://documentation.open-xchange.com/dovecot/se…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
Open-Xchange GmbH	OX Dovecot Pro	Affected: 2.3.0 , < 2.3.22.2 (semver) Affected: 3.0.0 , < 3.0.7 (semver) Affected: 3.1.0 , < 3.1.6 (semver)
Open-Xchange GmbH	OX Dovecot CE	Affected: 2.3.0 , < 2.4.5 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
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              "content": {
                "id": "CVE-2026-33605",
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                    "Exploitation": "none"
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                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-28T14:42:10.586486Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-28T15:55:19.368Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "core"
          ],
          "product": "OX Dovecot Pro",
          "vendor": "Open-Xchange GmbH",
          "versions": [
            {
              "lessThan": "2.3.22.2",
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              "version": "2.3.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.0.7",
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              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authenticating. If running in high-security mode (default for community releases), only the attacker\u0027s 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. Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
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              "value": "GENERAL"
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        "defect": "DOV-8994",
        "discovery": "EXTERNAL"
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  "dataType": "CVE_RECORD",
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CVE-2026-40018 (GCVE-0-2026-40018)

Vulnerability from cvelistv5 – Published: 2026-08-28 10:12 – Updated: 2026-08-28 15:00

Summary

None None None No publicly available exploits are known.

Severity

7.4 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 15:00 UTC

CWE

CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Assigner

OX CNA under the mitre root

CNA scorecard C 61/100 over 74 records in the last 180 days details

References

1 reference

URL	Tags
https://documentation.open-xchange.com/dovecot/se…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
Open-Xchange GmbH	OX Dovecot Pro	Affected: 2.3.0 , < 3.1.6 (semver)
Open-Xchange GmbH	OX Dovecot CE	Affected: 2.3.0 , < 2.4.5 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
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              "content": {
                "id": "CVE-2026-40018",
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                    "Technical Impact": "total"
                  }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "None None None No publicly available exploits are known."
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          "cvssV3_1": {
            "attackComplexity": "HIGH",
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            "confidentialityImpact": "HIGH",
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CVE-2026-40019 (GCVE-0-2026-40019)

Vulnerability from cvelistv5 – Published: 2026-08-28 10:12 – Updated: 2026-08-28 14:58

Summary

An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which makes it spin in an infinite loop consuming CPU. This can cause degradation or denial of service for Sieve script management, and repeated connections can consume all available CPU on the server. Monitor system for abnormal CPU usage and kill the offending process. Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 14:58 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

OX CNA under the mitre root

CNA scorecard C 61/100 over 74 records in the last 180 days details

References

1 reference

URL	Tags
https://documentation.open-xchange.com/dovecot/se…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Open-Xchange GmbH	OX Dovecot CE	Affected: 2.4.3 , < 2.4.5 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40019",
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
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      "source": {
        "defect": "DOV-9041",
        "discovery": "EXTERNAL"
      }
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CVE-2026-42007 (GCVE-0-2026-42007)

Vulnerability from cvelistv5 – Published: 2026-08-28 10:12 – Updated: 2026-08-28 15:54

Summary

An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-after-free in the mail editing code, and to write memory contents beyond the intended buffer into the delivered mail. This causes memory leak and opportunity to do memory corruption during mail delivery, which can crash the delivery process and may allow execution of arbitrary code in the context of that process. Disable the Sieve editheader extension. Update to non-vulnerable version. No publicly available exploits are known.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 14:32 UTC

CWE

CWE-416 - Use After Free

Assigner

OX CNA under the mitre root

CNA scorecard C 61/100 over 74 records in the last 180 days details

References

1 reference

URL	Tags
https://documentation.open-xchange.com/dovecot/se…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
Open-Xchange GmbH	OX Dovecot Pro	Affected: 2.3.0 , < 2.3.22.2 (semver) Affected: 3.0.0 , < 3.0.7 (semver) Affected: 3.1.0 , < 3.1.6 (semver)
Open-Xchange GmbH	OX Dovecot CE	Affected: 2.3.0 , < 2.4.5 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42007",
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            "attackComplexity": "LOW",
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CVE-2026-42391 (GCVE-0-2026-42391)

Vulnerability from cvelistv5 – Published: 2026-08-28 10:12 – Updated: 2026-08-28 15:54

Summary

An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in, which causes memory and CPU usage to grow disproportionately. The login process can be terminated by the out-of-memory handling, which also terminates all other connections handled by the same process. This can cause degradation or denial of service for IMAP logins. Limit the number of connections handled by a single imap-login process. This has a performance impact though. Update to non-vulnerable version. No publicly available exploits are known.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 14:42 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

OX CNA under the mitre root

CNA scorecard C 61/100 over 74 records in the last 180 days details

References

1 reference

URL	Tags
https://documentation.open-xchange.com/dovecot/se…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
Open-Xchange GmbH	OX Dovecot Pro	Affected: 2.3.0 , < 2.3.22.2 (semver) Affected: 3.0.0 , < 3.0.7 (semver) Affected: 3.1.0 , < 3.1.6 (semver)
Open-Xchange GmbH	OX Dovecot CE	Affected: 2.3.0 , < 2.4.5 (semver)

Show details on NVD website

JSON

To clipboard

{
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    "adp": [
      {
        "metrics": [
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                "id": "CVE-2026-42391",
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                  },
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
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          "vendor": "Open-Xchange GmbH",
          "versions": [
            {
              "lessThan": "2.4.5",
              "status": "affected",
              "version": "2.3.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in, which causes memory and CPU usage to grow disproportionately. The login process can be terminated by the out-of-memory handling, which also terminates all other connections handled by the same process. This can cause degradation or denial of service for IMAP logins. Limit the number of connections handled by a single imap-login process. This has a performance impact though. Update to non-vulnerable version. No publicly available exploits are known."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T10:30:55.218Z",
        "orgId": "8ce71d90-2354-404b-a86e-bec2cc4e6981",
        "shortName": "OX"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json"
        }
      ],
      "source": {
        "defect": "DOV-9529",
        "discovery": "INTERNAL"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8ce71d90-2354-404b-a86e-bec2cc4e6981",
    "assignerShortName": "OX",
    "cveId": "CVE-2026-42391",
    "datePublished": "2026-08-28T10:12:27.000Z",
    "dateReserved": "2026-04-27T08:53:58.839Z",
    "dateUpdated": "2026-08-28T15:54:09.305Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-73208 (GCVE-0-2026-73208)

Vulnerability from cvelistv5 – Published: 2026-08-28 10:12 – Updated: 2026-08-28 15:53

Summary

An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token response does not contain a scope claim, the audience claim is used in its place and checked against the configured required scopes. These are different concepts, and the audience claim does not describe what a token is allowed to do. A token that grants no relevant permissions can be accepted because its intended recipient value happens to match a configured scope name, granting access that should have been denied. It also hides an identity provider misconfiguration where scopes are not being issued at all. Ensure the identity provider issues a scope claim for all tokens used with Dovecot, and that configured scope names do not match audience values. Update to non-vulnerable version. No publicly available exploits are known.

Severity

7.4 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 15:14 UTC

CWE

CWE-287 - Improper Authentication

Assigner

OX CNA under the mitre root

CNA scorecard C 61/100 over 74 records in the last 180 days details

References

1 reference

URL	Tags
https://documentation.open-xchange.com/dovecot/se…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
Open-Xchange GmbH	OX Dovecot Pro	Affected: 2.3.13 , < 2.3.22.2 (semver) Affected: 3.0.0 , < 3.0.7 (semver) Affected: 3.1.0 , < 3.1.6 (semver)
Open-Xchange GmbH	OX Dovecot CE	Affected: 2.3.13 , < 2.4.5 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-73208",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-28T15:14:37.239590Z",
                "version": "2.0.3"
              },
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            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-28T15:53:21.257Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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              "version": "2.3.13",
              "versionType": "semver"
            },
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              "status": "affected",
              "version": "3.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.1.6",
              "status": "affected",
              "version": "3.1.0",
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          ]
        },
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              "versionType": "semver"
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      ],
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        }
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      "metrics": [
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            "attackComplexity": "HIGH",
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            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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      "source": {
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    "dateReserved": "2026-08-11T13:14:10.017Z",
    "dateUpdated": "2026-08-28T15:53:21.257Z",
    "state": "PUBLISHED"
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}

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.

Vulnerability timeline

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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.
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