Researcher demonstrates PostgreSQL flaw that can enable server RCE

PostgreSQL has issued patches addressing 52 security flaws, including a high‑risk type confusion vulnerability tracked as CVE-2026-6460. The flaw could allow a database user who can create objects to execute code on the server, with the attacker gaining the operating system privileges of the PostgreSQL process. The project notes that all versions prior to 18.7, 17.12, 16.16, 15.20, and 14.25 are affected.

The fix includes type‑checking enhancements to prevent old values of a composite type from being misinterpreted as if they had a new type; Red Hat’s CVE assessment also states that exploitation requires a login with the ability to create or modify objects.

A working exploit was described by security researcher Mehmet Ince, who demonstrated the attack on PostgreSQL 18.6, with the writeup outlining how to trigger a crash and later leak addresses; the final step enabling command execution is not included in that writeup.

Administrators are urged to update to PostgreSQL 18.7, 17.12, 16.16, 15.20, or 14.25 and to rebuild every C‑language extension alongside the server, as older extensions may load with reduced protection. The release notes also caution that extension packages may require source‑code changes and that some extensions will fail to load on older minor releases.

Other fixes in the patch set address client tools and related components; particular guidance covers reindexing after the update and considerations for environments such as Patroni. The advisory notes no workaround for servers that cannot be updated immediately, and highlights that PostgreSQL 14 is now end‑of‑life, with 14.25 being its last release.