RHSA-2026:13830 — Security Advisory
Red Hat Security Advisory: dovecot security update
Severity
ImportantRed Hat Product Security
Products
Official CSAF product identity
Published · May 6, 2026
Updated · June 30, 2026
Topic
An update for dovecot is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Description
Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages.
Security Fix(es):
-
dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command (CVE-2025-59032)
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dovecot: denial of service via crafted message before authentication (CVE-2026-27858)
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dovecot: denial of service via specially crafted NOOP command (CVE-2026-27857)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.