PostgreSQL Observable Response Discrepancy Vulnerability - CVE-2026-14672

Observable response discrepancy in PostgreSQL SCRAM authentication allows an unauthenticated user to test the existence of a user via observing the SCRAM iteration count. This requires the probed user to have a non-default scram_iterations count because the authentication challenge for a nonexistent user reports the default scram_iterations. Within major versions 16-18 minor versions before PostgreSQL 18.5 17.11 and 16.15 are affected. Versions before PostgreSQL 16 are unaffected.