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5.3 Medium

CVE-2026-14672 Observable response discrepancy in PostgreSQL SCRAM authentication allows an unauthenticated user to test the…

Description

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 18.6, 17.11, and 16.15 are affected. Versions before PostgreSQL 16 are unaffected.

Affected products and versions

Product Affected versions Fixed in
postgresql 18 18 → < 18.6 18.6
postgresql 17 17 → < 17.11 17.11
postgresql 16 16 → < 16.15 16.15

References

Timeline

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