RHSA-2026:50964: Important: postfix security update

Published Aug 6, 2026
·
Updated

Important: postfix security update

Other sources

The postfix packages provide a Mail Transport Agent (MTA), which supports protocols like LDAP, SMTP AUTH (SASL), and TLS.Security Fix(es): postfix: buffer over-read via malformed enhanced status code (CVE-2026-43964) 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.

— Red Hat

Affected Software

39 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux Server - TUS
Red Hat Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
redhat/postfix<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-cdb<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-cdb-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-debugsource<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-ldap<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-ldap-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-lmdb-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-mysql<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-mysql-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-pcre<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-pcre-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-perl-scripts<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-pgsql<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-pgsql-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-sqlite<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-sqlite-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-cdb<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-cdb-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-debugsource<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-ldap<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-ldap-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-lmdb-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-mysql<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-mysql-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-pcre<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-pcre-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-perl-scripts<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-pgsql<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-pgsql-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-sqlite<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1
redhat/postfix-sqlite-debuginfo<3.5.8-4.el8_8.1
3.5.8-4.el8_8.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1
  2. Upgrade

    Upgrade redhat/postfix-cdb to a version that resolves this vulnerability.

    Fixed in 3.5.8-4.el8_8.1
  3. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1
  4. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1
  5. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1
  6. Upgrade

    Upgrade redhat/postfix-ldap to a version that resolves this vulnerability.

    Fixed in 3.5.8-4.el8_8.1
  7. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1
  8. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1
  9. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1
  10. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1
  11. Upgrade

    Upgrade redhat/postfix-pcre to a version that resolves this vulnerability.

    Fixed in 3.5.8-4.el8_8.1
  12. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1
  13. Upgrade

    Upgrade redhat/postfix-perl-scripts to a version that resolves this vulnerability.

    Fixed in 3.5.8-4.el8_8.1
  14. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1
  15. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1
  16. Upgrade

    Upgrade redhat/postfix-sqlite to a version that resolves this vulnerability.

    Fixed in 3.5.8-4.el8_8.1
  17. Upgrade

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

    Fixed in 3.5.8-4.el8_8.1

Event History

Aug 6, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·01:50 AM
Data Sourced
via Red Hat·01:50 AM
Severity
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Frequently Asked Questions

1

What is the severity of RHSA-2026:50964?

The severity of RHSA-2026:50964 is rated as high with a score of 7.

2

How do I fix RHSA-2026:50964?

To fix RHSA-2026:50964, upgrade to the latest version of Postfix provided in the security update.

3

What software does RHSA-2026:50964 affect?

RHSA-2026:50964 affects various Red Hat Enterprise Linux distributions including Server and Extended Life Cycle versions.

4

What type of vulnerability is addressed in RHSA-2026:50964?

RHSA-2026:50964 addresses a security vulnerability in the Postfix mail transfer agent.

5

When was RHSA-2026:50964 published?

RHSA-2026:50964 was published on August 6, 2026.

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