Dovecot: Mehrere Schwachstellen
WID-SEC-2026-3076 · first 28.08.2026 · updated 14.10.2026 · CVSS 9,1
What it is about
Dovecot ist ein Open Source IMAP und POP3 E-Mail Server. Ein Angreifer kann mehrere Schwachstellen in Dovecot ausnutzen, um Sicherheitsvorkehrungen zu umgehen, sensible Informationen offenzulegen, Daten zu manipulieren oder Denial-of-Service-Zustände herbeizuführen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- Sicherheitsvorkehrungen zu umgehen
- sensible Informationen offenzulegen
- Daten zu manipulieren oder Denial-of-Service-Zustände herbeizuführen
Am I affected?
Affected according to the BSI:
- Debian Linux
- Amazon Linux 2
- Red Hat Enterprise Linux
- RESF Rocky Linux
- SUSE Linux
- SUSE openSUSE
- Oracle Linux
- Open Source Dovecot <2.4.5
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source Dovecot 2.4.5
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Dovecot and Pigeonhole v2.4.5 release vom 2026-08-27 dovecot.org
- Dovecot Security Advisory vom 2026-08-27 dovecot.org
- openSUSE Security Update OPENSUSE-SU-2026:11629-1 vom 2026-08-31 lists.opensuse.org
- SUSE Security Update SUSE-SU-2026:3919-1 vom 2026-09-10 lists.suse.com
- SUSE Security Update SUSE-SU-2026:4139-1 vom 2026-09-16 lists.suse.com
- SUSE Security Update SUSE-SU-2026:23595-1 vom 2026-09-16 lists.suse.com
- Debian Security Advisory DSA-6526 vom 2026-09-28 security-tracker.debian.org
- Amazon Linux Security Advisory ALAS2-2026-3935 vom 2026-09-29 alas.aws.amazon.com
- Red Hat Security Advisory RHSA-2026:76763 vom 2026-10-06 access.redhat.com
- Rocky Linux Security Advisory RLSA-2026:76763 vom 2026-10-07 errata.build.resf.org
- Oracle Linux Security Advisory ELSA-2026-76763 vom 2026-10-07 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-79371 vom 2026-10-09 linux.oracle.com
- Red Hat Security Advisory RHSA-2026:79371 vom 2026-10-08 access.redhat.com
- Rocky Linux Security Advisory RLSA-2026:79371 vom 2026-10-10 errata.build.resf.org
- Oracle Linux Security Advisory ELSA-2026-80825 vom 2026-10-12 linux.oracle.com
- Red Hat Security Advisory RHSA-2026:80825 vom 2026-10-12 access.redhat.com
- Rocky Linux Security Advisory RLSA-2026:80825 vom 2026-10-14 errata.build.resf.org
CVE: CVE-2023-51764, CVE-2023-51766, 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-2026-40019, CVE-2026-40203, CVE-2026-40204, CVE-2026-40205, CVE-2026-4200, CVE-2026-42007, CVE-2026-42008 …
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.