RHSA-2026:4509 - Security Advisory

Topic

An update for the postgresql:12 module is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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

PostgreSQL is an advanced object-relational database management system (DBMS).

Security Fix(es):

• postgresql: PostgreSQL missing validation of multibyte character length executes arbitrary code (CVE-2026-2006)
• postgresql: PostgreSQL intarray missing validation of type of input to selectivity estimator executes arbitrary code (CVE-2026-2004)
• postgresql: PostgreSQL pgcrypto heap buffer overflow executes arbitrary code (CVE-2026-2005)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support Extension 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2439324 - CVE-2026-2006 postgresql: PostgreSQL missing validation of multibyte character length executes arbitrary code
• BZ - 2439325 - CVE-2026-2004 postgresql: PostgreSQL intarray missing validation of type of input to selectivity estimator executes arbitrary code
• BZ - 2439326 - CVE-2026-2005 postgresql: PostgreSQL pgcrypto heap buffer overflow executes arbitrary code

CVEs

• CVE-2026-2004
• CVE-2026-2005
• CVE-2026-2006

References

• https://access.redhat.com/security/updates/classification/#important