Security update for dovecot24

Announcement ID:	SUSE-SU-2026:21208-1
Release Date:	2026-04-16T13:10:27Z
Rating:	important
References:	bsc#1260893 bsc#1260894 bsc#1260895 bsc#1260896 bsc#1260897 bsc#1260898 bsc#1260899 bsc#1260900 bsc#1260901 bsc#1260902
Cross-References:	CVE-2025-59028 CVE-2025-59031 CVE-2025-59032 CVE-2026-24031 CVE-2026-27855 CVE-2026-27856 CVE-2026-27857 CVE-2026-27858 CVE-2026-27859 CVE-2026-27860
CVSS scores:	CVE-2025-59028 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVE-2025-59028 ( NVD ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVE-2025-59031 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVE-2025-59031 ( SUSE ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVE-2025-59031 ( NVD ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVE-2025-59032 ( 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-2025-59032 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVE-2025-59032 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVE-2026-24031 ( SUSE ): 9.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N CVE-2026-24031 ( SUSE ): 7.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L CVE-2026-24031 ( NVD ): 7.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L CVE-2026-27855 ( SUSE ): 7.6 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVE-2026-27855 ( SUSE ): 6.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N CVE-2026-27855 ( NVD ): 6.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N CVE-2026-27856 ( SUSE ): 9.1 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVE-2026-27856 ( SUSE ): 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVE-2026-27856 ( NVD ): 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVE-2026-27857 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVE-2026-27857 ( SUSE ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CVE-2026-27857 ( NVD ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CVE-2026-27858 ( 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-2026-27858 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVE-2026-27858 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVE-2026-27859 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVE-2026-27859 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVE-2026-27859 ( NVD ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVE-2026-27860 ( SUSE ): 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVE-2026-27860 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CVE-2026-27860 ( NVD ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected Products:	SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0

An update that solves 10 vulnerabilities can now be installed.

Description:

This update for dovecot24 fixes the following issues:

• Update to v2.4.3
• CVE-2025-59028: Invalid base64 authentication can cause DoS for other logins (bsc#1260894).
• CVE-2025-59031: decode2text.sh OOXML extraction may follow symlinks and read unintended files during indexing (bsc#1260895).
• CVE-2025-59032: pigeonhole: ManageSieve panic occurs with sieve-connect as a client (bsc#1260902).
• CVE-2026-24031: SQL injection possible if auth_username_chars is configured empty. Fixed escaping to always happen. v2.4 regression (bsc#1260896).
• CVE-2026-27855: OTP driver vulnerable to replay attack (bsc#1260900).
• CVE-2026-27856: Doveadm credentials were not checked using timing-safe checking function (bsc#1260899).
• CVE-2026-27857: sending excessive parenthesis causes imap-login to use excessive memory (bsc#1260898).
• CVE-2026-27858: pigeonhole: managesieve-login can allocate large amount of memory during authentication (bsc#1260901).
• CVE-2026-27859: excessive RFC 2231 MIME parameters in email would can excessive CPU usage (bsc#1260897).
• CVE-2026-27860: LDAP query injection possible if auth_username_chars is configured empty. Fixed escaping to always happen. v2.4 regression (bsc#1260893).

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 16.0
  zypper in -t patch SUSE-SLES-16.0-577=1
• SUSE Linux Enterprise Server for SAP applications 16.0
  zypper in -t patch SUSE-SLES-16.0-577=1

Package List:

• SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
  • dovecot24-fts-solr-2.4.3-160000.1.1
  • dovecot24-fts-solr-debuginfo-2.4.3-160000.1.1
  • dovecot24-debugsource-2.4.3-160000.1.1
  • dovecot24-backend-mysql-debuginfo-2.4.3-160000.1.1
  • dovecot24-backend-pgsql-debuginfo-2.4.3-160000.1.1
  • dovecot24-backend-sqlite-debuginfo-2.4.3-160000.1.1
  • dovecot24-devel-2.4.3-160000.1.1
  • dovecot24-fts-debuginfo-2.4.3-160000.1.1
  • dovecot24-backend-pgsql-2.4.3-160000.1.1
  • dovecot24-debuginfo-2.4.3-160000.1.1
  • dovecot24-fts-2.4.3-160000.1.1
  • dovecot24-2.4.3-160000.1.1
  • dovecot24-backend-mysql-2.4.3-160000.1.1
  • dovecot24-backend-sqlite-2.4.3-160000.1.1
• SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
  • dovecot24-fts-solr-2.4.3-160000.1.1
  • dovecot24-fts-solr-debuginfo-2.4.3-160000.1.1
  • dovecot24-debugsource-2.4.3-160000.1.1
  • dovecot24-backend-mysql-debuginfo-2.4.3-160000.1.1
  • dovecot24-backend-pgsql-debuginfo-2.4.3-160000.1.1
  • dovecot24-backend-sqlite-debuginfo-2.4.3-160000.1.1
  • dovecot24-devel-2.4.3-160000.1.1
  • dovecot24-fts-debuginfo-2.4.3-160000.1.1
  • dovecot24-backend-pgsql-2.4.3-160000.1.1
  • dovecot24-debuginfo-2.4.3-160000.1.1
  • dovecot24-fts-2.4.3-160000.1.1
  • dovecot24-2.4.3-160000.1.1
  • dovecot24-backend-mysql-2.4.3-160000.1.1
  • dovecot24-backend-sqlite-2.4.3-160000.1.1

References:

• https://www.suse.com/security/cve/CVE-2025-59028.html
• https://www.suse.com/security/cve/CVE-2025-59031.html
• https://www.suse.com/security/cve/CVE-2025-59032.html
• https://www.suse.com/security/cve/CVE-2026-24031.html
• https://www.suse.com/security/cve/CVE-2026-27855.html
• https://www.suse.com/security/cve/CVE-2026-27856.html
• https://www.suse.com/security/cve/CVE-2026-27857.html
• https://www.suse.com/security/cve/CVE-2026-27858.html
• https://www.suse.com/security/cve/CVE-2026-27859.html
• https://www.suse.com/security/cve/CVE-2026-27860.html
• https://bugzilla.suse.com/show_bug.cgi?id=1260893
• https://bugzilla.suse.com/show_bug.cgi?id=1260894
• https://bugzilla.suse.com/show_bug.cgi?id=1260895
• https://bugzilla.suse.com/show_bug.cgi?id=1260896
• https://bugzilla.suse.com/show_bug.cgi?id=1260897
• https://bugzilla.suse.com/show_bug.cgi?id=1260898
• https://bugzilla.suse.com/show_bug.cgi?id=1260899
• https://bugzilla.suse.com/show_bug.cgi?id=1260900
• https://bugzilla.suse.com/show_bug.cgi?id=1260901
• https://bugzilla.suse.com/show_bug.cgi?id=1260902