Alerts This Week
Warning Icon 1 815
Alerts This Week
Warning Icon 1 815

SUSE Dovecot24 Important Security Update Addressing Five Key Issues

suse
Calendar Grey June 23, 2026
Dist Suse Esm H88
SUSE's important update addresses five vulnerabilities in dovecot24, enhancing security for users and systems.
An update that solves five vulnerabilities can now be installed.

Summary

## 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:

Topics%20covered

Topics Covered

security advisory SuSE DoS important data leakage dovecot24

References

* bsc#1265146

* bsc#1265147

* bsc#1265148

* bsc#1265149

* bsc#1265150

Cross-

* 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

Severity
important
Lowest
Low
Medium
High
Critical

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

Topics%20covered

Topics Covered

security advisory SuSE DoS important data leakage dovecot24

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here