Fedora 43 Dovecot Important DoS Security Fix 2026-51dba40a65
fedora
May 7, 2026
updated to 2.4.3 which includes several security fixes
Summary
Dovecot is an IMAP server for Linux/UNIX-like systems, written with security
primarily in mind. It also contains a small POP3 server. It supports mail
in either of maildir or mbox formats.
The SQL drivers and authentication plug-ins are in their subpackages.
Update Information:
updated to 2.4.3 which includes several security fixes
Topics Covered
Change Log
* Thu Apr 16 2026 Tom Callaway
References
[ 1 ] Bug #2452241 - CVE-2026-27858 dovecot: denial of service via crafted message before authentication [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2452241
[ 2 ] Bug #2452245 - CVE-2026-27857 dovecot: denial of service via specially crafted NOOP command [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2452245
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-51dba40a65' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label
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Severity
important
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Critical
Name: dovecot
Product: Fedora 43
Version: 2.4.3
Release: 2.fc43
Summary: Secure imap and pop3 server
Topics Covered
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