RHSA-2026:46381: Important: dovecot security update

Published Jul 27, 2026
·
Updated

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: Dovecot: Denial of Service via excessive IMAP bracing (CVE-2026-42006) 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.

Affected Software

23 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life
Red Hat Red Hat Enterprise Linux Server - TUS
Red Hat Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
redhat/dovecot<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-debuginfo<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-debugsource<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-mysql<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-mysql-debuginfo<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-pgsql<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-pgsql-debuginfo<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-pigeonhole<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-pigeonhole-debuginfo<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-debuginfo<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-debugsource<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-mysql<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-mysql-debuginfo<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-pgsql<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-pgsql-debuginfo<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-pigeonhole<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2
redhat/dovecot-pigeonhole-debuginfo<2.3.16-3.el8_8.2
2.3.16-3.el8_8.2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/dovecot to a version that resolves this vulnerability.

    Fixed in 2.3.16-3.el8_8.2
  2. Upgrade

    Upgrade redhat/dovecot-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.3.16-3.el8_8.2
  3. Upgrade

    Upgrade redhat/dovecot-debugsource to a version that resolves this vulnerability.

    Fixed in 2.3.16-3.el8_8.2
  4. Upgrade

    Upgrade redhat/dovecot-mysql to a version that resolves this vulnerability.

    Fixed in 2.3.16-3.el8_8.2
  5. Upgrade

    Upgrade redhat/dovecot-mysql-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.3.16-3.el8_8.2
  6. Upgrade

    Upgrade redhat/dovecot-pgsql to a version that resolves this vulnerability.

    Fixed in 2.3.16-3.el8_8.2
  7. Upgrade

    Upgrade redhat/dovecot-pgsql-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.3.16-3.el8_8.2
  8. Upgrade

    Upgrade redhat/dovecot-pigeonhole to a version that resolves this vulnerability.

    Fixed in 2.3.16-3.el8_8.2
  9. Upgrade

    Upgrade redhat/dovecot-pigeonhole-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.3.16-3.el8_8.2
  10. Upgrade

    Upgrade dovecot to a version that resolves this vulnerability.

    Patch CVE-2026-42006

Event History

Jul 27, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·01:05 AM
Data Sourced
via Red Hat·01:05 AM
Severity
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Frequently Asked Questions

1

What is the severity of RHSA-2026:46381?

The severity of RHSA-2026:46381 is rated as high, with a score of 7.

2

What vulnerabilities does RHSA-2026:46381 address?

RHSA-2026:46381 addresses security vulnerabilities found in the Dovecot IMAP server.

3

How do I fix RHSA-2026:46381?

To fix RHSA-2026:46381, users should apply the latest security update for Dovecot as provided by Red Hat.

4

Is RHSA-2026:46381 applicable to all Dovecot installations?

RHSA-2026:46381 applies to all installations of Dovecot on supported Red Hat systems.

5

What should I do if I cannot apply the update for RHSA-2026:46381 immediately?

If unable to apply the update for RHSA-2026:46381 immediately, it is recommended to review your system's security posture and minimize exposure until the update can be applied.

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