RHSA-2026:6391 — Security Advisory

Red Hat Security Advisory: mysql:8.4 security update

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Severity

Moderate

Red Hat Product Security

RHEL 8

Products

Official CSAF product identity

Published · April 2, 2026

Updated · July 9, 2026

Topic

An update for the mysql:8.4 module is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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

MySQL is a multi-user, multi-threaded SQL database server. It consists of the MySQL server daemon (mysqld) and many client programs and libraries.

Security Fix(es):

mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21941)
mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21948)
mysql: InnoDB unspecified vulnerability (CPU Jan 2026) (CVE-2026-21936)
mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21968)
mysql: DDL unspecified vulnerability (CPU Jan 2026) (CVE-2026-21937)
mysql: Thread Pooling unspecified vulnerability (CPU Jan 2026) (CVE-2026-21964)

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.