CVE-2026-6478

Name of the Vulnerable Software and Affected Versions PostgreSQL versions prior to 18.4 PostgreSQL versions prior to 17.10 PostgreSQL versions prior to 16.14 PostgreSQL versions prior to 15.18 PostgreSQL versions prior to 14.23

Description A covert timing channel exists during the comparison of MD5-hashed passwords in the authentication process. This allows an attacker to recover user credentials to gain authentication. This issue does not affect scram-sha-256 passwords, which are the default in all supported releases, but may impact databases with MD5-hashed passwords resulting from upgrades from version 13 or earlier.

Recommendations Update to version 18.4 or later. Update to version 17.10 or later. Update to version 16.14 or later. Update to version 15.18 or later. Update to version 14.23 or later.