High-severity CVE-2026-6460 affects PostgreSQL, allows arbitrary code execution

## Overview CVE-2026-6460 is a high-severity vulnerability affecting multiple versions of PostgreSQL. It allows an object creator to execute arbitrary code as the operating system user running the database. This is primarily achieved via the `ALTER ... SET DATA TYPE` command. Other attack vectors include `ALTER TABLE ... ADD COLUMN; ROLLBACK; ALTER TABLE ... ADD COLUMN`. ## Technical Details The vulnerability stems from type confusion within PostgreSQL. The system lacks adequate tracking of typed values, leading to stale values appearing in data dictionary entries and PL/pgSQL variables. This inadequacy allows attackers to manipulate data types and execute malicious code. The affected versions include those prior to PostgreSQL 18.7, 17.12, 16.16, 15.20, and 14.25. ## Impact Successful exploitation of CVE-2026-6460 could allow an attacker to gain control over the database and execute arbitrary code. This poses a significant risk to data integrity and system security, as the attacker operates with the privileges of the database's operating system user. ## Mitigation Defenders should immediately upgrade to the latest versions of PostgreSQL: 18.7, 17.12, 16.16, 15.20, or 14.25. Regularly review and apply security patches to maintain system integrity. Additionally, monitor database activity for unusual commands that could indicate exploitation attempts.