SUSE-SU-2026:23595-1: critical: Security update for dovecot24
SLE-SECURITY-UPDATES
null at suse.de
Mon Sep 14 17:09:07 UTC 2026
# Security update for dovecot24
Announcement ID: SUSE-SU-2026:23595-1
Release Date: 2026-09-01T14:11:32Z
Rating: critical
References:
* bsc#1276794
* bsc#1276795
* bsc#1276799
* bsc#1276800
* bsc#1276802
* bsc#1276804
* bsc#1276807
* bsc#1276809
* bsc#1276810
* bsc#1276812
* bsc#1276813
* bsc#1276815
* bsc#1276817
* bsc#1276819
* bsc#1276820
* bsc#1276824
* bsc#1276826
* bsc#1276827
* bsc#1276828
* bsc#1276829
* bsc#1276830
* bsc#1276833
* bsc#1276835
* bsc#1276837
Cross-References:
* CVE-2026-27852
* CVE-2026-33263
* CVE-2026-33604
* CVE-2026-33605
* CVE-2026-33606
* CVE-2026-33607
* CVE-2026-40013
* CVE-2026-40014
* CVE-2026-40015
* CVE-2026-40017
* CVE-2026-40018
* CVE-2026-40203
* CVE-2026-40204
* CVE-2026-40205
* CVE-2026-42007
* CVE-2026-42008
* CVE-2026-42391
* CVE-2026-42392
* CVE-2026-42393
* CVE-2026-42395
* CVE-2026-52681
* CVE-2026-52687
* CVE-2026-73208
* CVE-2026-73209
CVSS scores:
* CVE-2026-27852 ( 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-2026-27852 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-27852 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-33263 ( SUSE ): 4.8
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
* CVE-2026-33263 ( SUSE ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-33263 ( NVD ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-33604 ( SUSE ): 8.2
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-33604 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
* CVE-2026-33604 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
* CVE-2026-33605 ( 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-2026-33605 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-33605 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-33606 ( SUSE ): 5.7
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-33606 ( SUSE ): 4.8 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
* CVE-2026-33606 ( NVD ): 4.8 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
* CVE-2026-33607 ( 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-2026-33607 ( SUSE ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-33607 ( NVD ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-40013 ( 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-2026-40013 ( SUSE ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-40013 ( NVD ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-40014 ( SUSE ): 6.9
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
* CVE-2026-40014 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
* CVE-2026-40014 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
* CVE-2026-40015 ( 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-2026-40015 ( SUSE ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-40015 ( NVD ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-40017 ( SUSE ): 6.9
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
* CVE-2026-40017 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
* CVE-2026-40017 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
* CVE-2026-40018 ( SUSE ): 9.1
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-40018 ( SUSE ): 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
* CVE-2026-40018 ( NVD ): 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
* CVE-2026-40203 ( SUSE ): 6.3
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
* CVE-2026-40203 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
* CVE-2026-40203 ( NVD ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
* CVE-2026-40204 ( SUSE ): 2.3
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
* CVE-2026-40204 ( SUSE ): 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
* CVE-2026-40204 ( NVD ): 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
* CVE-2026-40205 ( SUSE ): 6.0
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-40205 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
* CVE-2026-40205 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
* CVE-2026-42007 ( SUSE ): 8.5
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:L/SI:L/SA:H
* CVE-2026-42007 ( SUSE ): 9.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
* CVE-2026-42007 ( NVD ): 9.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
* CVE-2026-42008 ( SUSE ): 5.3
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
* CVE-2026-42008 ( SUSE ): 4.3 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
* CVE-2026-42008 ( NVD ): 4.3 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
* CVE-2026-42391 ( 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-2026-42391 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-42391 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-42392 ( SUSE ): 5.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
* CVE-2026-42392 ( SUSE ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
* CVE-2026-42392 ( NVD ): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
* CVE-2026-42393 ( SUSE ): 2.3
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
* CVE-2026-42393 ( SUSE ): 3.1 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
* CVE-2026-42393 ( NVD ): 3.1 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
* CVE-2026-42395 ( SUSE ): 4.3 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-42395 ( NVD ): 4.3 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-52681 ( SUSE ): 6.3
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
* CVE-2026-52681 ( SUSE ): 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-52681 ( NVD ): 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-52687 ( 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-2026-52687 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-52687 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-73208 ( SUSE ): 9.1
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-73208 ( SUSE ): 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
* CVE-2026-73208 ( NVD ): 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
* CVE-2026-73209 ( SUSE ): 7.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:L/SI:N/SA:N
* CVE-2026-73209 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-73209 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Products:
* SUSE Linux Enterprise Server 16.0
* SUSE Linux Enterprise Server for SAP applications 16.0
An update that solves 24 vulnerabilities can now be installed.
## Description:
This update for dovecot24 fixes the following issues:
Update to 2.4.5.
* CVE-2026-33263: `submission-login`: panic when `mail_max_userip_connections`
is reached (bsc#1276794).
* CVE-2026-27852: DoS by sending mail with bad header (bsc#1276799).
* CVE-2026-33604: SMTP smuggling via missing dot-stuffing after bare carriage
return (bsc#1276802).
* CVE-2026-33605: `managesieve-login`: pre-auth crash (bsc#1276809).
* CVE-2026-33606: `dsync`: mail content can cause `dsync` protocol injection
(bsc#1276800).
* CVE-2026-33607: IMAP `LIST` `match_sub()` exponential backtracking leading
to CPU denial of service (bsc#1276795).
* CVE-2026-40013: stack buffer underflow in `pigeonhole` `ManageSieve`
`CHECKSCRIPT/PUTSCRIPT` (bsc#1276807).
* CVE-2026-40014: CPU DoS via crafted references header (bsc#1276804).
* CVE-2026-40015: `imap-hibernate` can be crashed (bsc#1276812).
* CVE-2026-40017: CPU DoS via CRC32 hash collision in `strmap` (bsc#1276813).
* CVE-2026-40018: MySQL multi-byte escaping performed incorrectly
(bsc#1276810).
* CVE-2026-40203: IMAP compression can reveal whether a small synced email
body matches sender-chosen text (bsc#1276815).
* CVE-2026-40204: `lda_mailbox_autocreate` can bypass ACL restrictions
(bsc#1276819).
* CVE-2026-40205: OAuth2 `passdb` scope enforcement bypass via OR semantics in
remote validation path (bsc#1276820).
* CVE-2026-42007: `sieve` `editheader` RCE (bsc#1276817).
* CVE-2026-42008: `XCLIENT FORWARD= bare` token not namespaced (bsc#1276824).
* CVE-2026-42391: `imap`: pre-login memory/CPU growth with `ID` command
(bsc#1276835).
* CVE-2026-42392: `imap-urlauth` leaks memory into user-visible error messages
(bsc#1276829).
* CVE-2026-42393: `doveadm_password` or api key length can be leaked with
timing comparisons (bsc#1276827).
* CVE-2026-52687: `imap`: `COMPRESS ZSTD` can cause excessive memory usage
(bsc#1276837).
* CVE-2026-42395: single NUL-byte `XCLIENT FORWARD` payload crashes
(bsc#1276826).
* CVE-2026-52681: `sieve` resource usage tracking lost when active script
changes (bsc#1276828).
* CVE-2026-73208: `auth`: `db-oauth2`: `aud` claim used as fallback for
missing scope claim (bsc#1276830).
* CVE-2026-73209: `imap-login` crash due to self-recursion on zero-output
decompress chunks (bsc#1276833).
## 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-16.0-1578
* SUSE Linux Enterprise Server 16.0
zypper in -t patch SUSE-SLES-16.0-1578
## Package List:
* SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
* dovecot24-fts-solr-debuginfo-2.4.4-160000.2.1
* dovecot24-backend-mysql-debuginfo-2.4.4-160000.2.1
* dovecot24-backend-sqlite-2.4.4-160000.2.1
* dovecot24-backend-mysql-2.4.4-160000.2.1
* dovecot24-backend-pgsql-2.4.4-160000.2.1
* dovecot24-fts-2.4.4-160000.2.1
* dovecot24-fts-solr-2.4.4-160000.2.1
* dovecot24-backend-pgsql-debuginfo-2.4.4-160000.2.1
* dovecot24-backend-sqlite-debuginfo-2.4.4-160000.2.1
* dovecot24-fts-debuginfo-2.4.4-160000.2.1
* dovecot24-debugsource-2.4.4-160000.2.1
* dovecot24-2.4.4-160000.2.1
* dovecot24-debuginfo-2.4.4-160000.2.1
* dovecot24-devel-2.4.4-160000.2.1
* SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
* dovecot24-fts-solr-debuginfo-2.4.4-160000.2.1
* dovecot24-backend-mysql-debuginfo-2.4.4-160000.2.1
* dovecot24-backend-sqlite-2.4.4-160000.2.1
* dovecot24-backend-mysql-2.4.4-160000.2.1
* dovecot24-backend-pgsql-2.4.4-160000.2.1
* dovecot24-fts-2.4.4-160000.2.1
* dovecot24-fts-solr-2.4.4-160000.2.1
* dovecot24-backend-pgsql-debuginfo-2.4.4-160000.2.1
* dovecot24-backend-sqlite-debuginfo-2.4.4-160000.2.1
* dovecot24-fts-debuginfo-2.4.4-160000.2.1
* dovecot24-debugsource-2.4.4-160000.2.1
* dovecot24-2.4.4-160000.2.1
* dovecot24-debuginfo-2.4.4-160000.2.1
* dovecot24-devel-2.4.4-160000.2.1
## References:
* https://www.suse.com/security/cve/CVE-2026-27852.html
* https://www.suse.com/security/cve/CVE-2026-33263.html
* https://www.suse.com/security/cve/CVE-2026-33604.html
* https://www.suse.com/security/cve/CVE-2026-33605.html
* https://www.suse.com/security/cve/CVE-2026-33606.html
* https://www.suse.com/security/cve/CVE-2026-33607.html
* https://www.suse.com/security/cve/CVE-2026-40013.html
* https://www.suse.com/security/cve/CVE-2026-40014.html
* https://www.suse.com/security/cve/CVE-2026-40015.html
* https://www.suse.com/security/cve/CVE-2026-40017.html
* https://www.suse.com/security/cve/CVE-2026-40018.html
* https://www.suse.com/security/cve/CVE-2026-40203.html
* https://www.suse.com/security/cve/CVE-2026-40204.html
* https://www.suse.com/security/cve/CVE-2026-40205.html
* https://www.suse.com/security/cve/CVE-2026-42007.html
* https://www.suse.com/security/cve/CVE-2026-42008.html
* https://www.suse.com/security/cve/CVE-2026-42391.html
* https://www.suse.com/security/cve/CVE-2026-42392.html
* https://www.suse.com/security/cve/CVE-2026-42393.html
* https://www.suse.com/security/cve/CVE-2026-42395.html
* https://www.suse.com/security/cve/CVE-2026-52681.html
* https://www.suse.com/security/cve/CVE-2026-52687.html
* https://www.suse.com/security/cve/CVE-2026-73208.html
* https://www.suse.com/security/cve/CVE-2026-73209.html
* https://bugzilla.suse.com/show_bug.cgi?id=1276794
* https://bugzilla.suse.com/show_bug.cgi?id=1276795
* https://bugzilla.suse.com/show_bug.cgi?id=1276799
* https://bugzilla.suse.com/show_bug.cgi?id=1276800
* https://bugzilla.suse.com/show_bug.cgi?id=1276802
* https://bugzilla.suse.com/show_bug.cgi?id=1276804
* https://bugzilla.suse.com/show_bug.cgi?id=1276807
* https://bugzilla.suse.com/show_bug.cgi?id=1276809
* https://bugzilla.suse.com/show_bug.cgi?id=1276810
* https://bugzilla.suse.com/show_bug.cgi?id=1276812
* https://bugzilla.suse.com/show_bug.cgi?id=1276813
* https://bugzilla.suse.com/show_bug.cgi?id=1276815
* https://bugzilla.suse.com/show_bug.cgi?id=1276817
* https://bugzilla.suse.com/show_bug.cgi?id=1276819
* https://bugzilla.suse.com/show_bug.cgi?id=1276820
* https://bugzilla.suse.com/show_bug.cgi?id=1276824
* https://bugzilla.suse.com/show_bug.cgi?id=1276826
* https://bugzilla.suse.com/show_bug.cgi?id=1276827
* https://bugzilla.suse.com/show_bug.cgi?id=1276828
* https://bugzilla.suse.com/show_bug.cgi?id=1276829
* https://bugzilla.suse.com/show_bug.cgi?id=1276830
* https://bugzilla.suse.com/show_bug.cgi?id=1276833
* https://bugzilla.suse.com/show_bug.cgi?id=1276835
* https://bugzilla.suse.com/show_bug.cgi?id=1276837
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