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SUSE Dovecot22 Important Security Update Three Issues 2026-2645-1

suse
Calendar Grey June 26, 2026
Dist Suse Esm H88
An important SUSE update for dovecot22 fixes three security issues related to IMAP and memory usage. Upgrade recommended.
An update that solves three vulnerabilities can now be installed.

Summary

## This update for dovecot22 fixes the following issues * CVE-2026-33603: login: base64 input can contain tabs that bypass IPC protection (bsc#1265147). * 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). ## 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 12 SP5 LTSS zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-2026-2645=1 * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-2645=1 ## Package List:

Topics%20covered

Topics Covered

security advisory SuSE important memory usage IMAP issue dovecot22

References

* bsc#1265147

* bsc#1265149

* bsc#1265150

Cross-

* CVE-2026-33603

* CVE-2026-40020

* CVE-2026-42006

CVSS scores:

* 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-2026-40020 ( 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

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:2645-1
Release Date: 2026-06-26T09:00:45Z
Rating: important

Topics%20covered

Topics Covered

security advisory SuSE important memory usage IMAP issue dovecot22

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