SUSE-SU-2026:22185-1: important: Security update for dovecot24

Tue Jun 23 16:38:09 UTC 2026

# Security update for dovecot24

Announcement ID: SUSE-SU-2026:22185-1  
Release Date: 2026-06-19T17:08:41Z  
Rating: important  
References:

  * bsc#1265146
  * bsc#1265147
  * bsc#1265148
  * bsc#1265149
  * bsc#1265150

Cross-References:

  * CVE-2026-27851
  * CVE-2026-33603
  * CVE-2026-40016
  * CVE-2026-40020
  * CVE-2026-42006

CVSS scores:

  * CVE-2026-27851 ( SUSE ):  9.1
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-27851 ( SUSE ):  7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-27851 ( NVD ):  9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-27851 ( NVD ):  7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-33603 ( SUSE ):  7.6
    CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-33603 ( SUSE ):  6.8 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-33603 ( NVD ):  6.8 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-33603 ( NVD ):  5.3 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-40016 ( SUSE ):  7.1
    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-40016 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-40016 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-40016 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-40020 ( SUSE ):  5.3
    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-40020 ( SUSE ):  4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-40020 ( NVD ):  3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-40020 ( NVD ):  4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-42006 ( SUSE ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-42006 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-42006 ( NVD ):  4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected Products:

  * SUSE Linux Enterprise Server 16.0
  * SUSE Linux Enterprise Server for SAP applications 16.0

An update that solves five vulnerabilities can now be installed.

## Description:

This update for dovecot24 fixes the following issues

  * CVE-2026-27851: lib-var-expand: safe filter leaks to all following pipelines
    (bsc#1265146).
  * CVE-2026-33603: login: base64 input can contain tabs that bypass IPC
    protection (bsc#1265147).
  * CVE-2026-40016: Sieve: contains/: matches O(NxM) substring match bypasses
    sieve_max_cpu_time limit (bsc#1265148).
  * CVE-2026-40020: IMAP folders can be shared-spammed to everyone
    (bsc#1265149).
  * CVE-2026-42006: imap-login: uncontrolled memory usage with excessive bracing
    over IMAP (bsc#1265150).

Changes for dovecot24:

  * Update to 2.4.4

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Enterprise Server for SAP applications 16.0  
    zypper in -t patch SUSE-SLES-16.0-974=1

  * SUSE Linux Enterprise Server 16.0  
    zypper in -t patch SUSE-SLES-16.0-974=1

## Package List:

  * SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
    * dovecot24-debugsource-2.4.4-160000.1.1
    * dovecot24-fts-solr-debuginfo-2.4.4-160000.1.1
    * dovecot24-devel-2.4.4-160000.1.1
    * dovecot24-backend-mysql-debuginfo-2.4.4-160000.1.1
    * dovecot24-backend-mysql-2.4.4-160000.1.1
    * dovecot24-backend-pgsql-debuginfo-2.4.4-160000.1.1
    * dovecot24-backend-pgsql-2.4.4-160000.1.1
    * dovecot24-backend-sqlite-debuginfo-2.4.4-160000.1.1
    * dovecot24-debuginfo-2.4.4-160000.1.1
    * dovecot24-2.4.4-160000.1.1
    * dovecot24-fts-2.4.4-160000.1.1
    * dovecot24-backend-sqlite-2.4.4-160000.1.1
    * dovecot24-fts-debuginfo-2.4.4-160000.1.1
    * dovecot24-fts-solr-2.4.4-160000.1.1
  * SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
    * dovecot24-debugsource-2.4.4-160000.1.1
    * dovecot24-fts-solr-debuginfo-2.4.4-160000.1.1
    * dovecot24-devel-2.4.4-160000.1.1
    * dovecot24-backend-mysql-debuginfo-2.4.4-160000.1.1
    * dovecot24-backend-mysql-2.4.4-160000.1.1
    * dovecot24-backend-pgsql-debuginfo-2.4.4-160000.1.1
    * dovecot24-backend-pgsql-2.4.4-160000.1.1
    * dovecot24-backend-sqlite-debuginfo-2.4.4-160000.1.1
    * dovecot24-debuginfo-2.4.4-160000.1.1
    * dovecot24-2.4.4-160000.1.1
    * dovecot24-fts-2.4.4-160000.1.1
    * dovecot24-backend-sqlite-2.4.4-160000.1.1
    * dovecot24-fts-debuginfo-2.4.4-160000.1.1
    * dovecot24-fts-solr-2.4.4-160000.1.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-27851.html
  * https://www.suse.com/security/cve/CVE-2026-33603.html
  * https://www.suse.com/security/cve/CVE-2026-40016.html
  * https://www.suse.com/security/cve/CVE-2026-40020.html
  * https://www.suse.com/security/cve/CVE-2026-42006.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1265146
  * https://bugzilla.suse.com/show_bug.cgi?id=1265147
  * https://bugzilla.suse.com/show_bug.cgi?id=1265148
  * https://bugzilla.suse.com/show_bug.cgi?id=1265149
  * https://bugzilla.suse.com/show_bug.cgi?id=1265150

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