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CVE-2026-14672 - PostgreSQL observable response discrepancy with non-default scram_iterations provides user existence oracle

CVE ID :CVE-2026-14672
Published : Aug. 13, 2026, 1 p.m. | 29 minutes ago
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 18.5, 17.11, and 16.15 are affected. Versions before PostgreSQL 16 are unaffected.
Severity: 5.3 | MEDIUM
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