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.

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Thu, 13 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 13 Aug 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Postgresql
Postgresql postgresql
Vendors & Products Postgresql
Postgresql postgresql

Thu, 13 Aug 2026 13:15:00 +0000

Type Values Removed Values Added
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.
Title PostgreSQL observable response discrepancy with non-default scram_iterations provides user existence oracle
Weaknesses CWE-204
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: PostgreSQL

Published:

Updated: 2026-08-13T15:35:56.925Z

Reserved: 2026-07-03T20:28:13.749Z

Link: CVE-2026-14672

cve-icon Vulnrichment

Updated: 2026-08-13T15:35:50.664Z

cve-icon NVD

Status : Received

Published: 2026-08-13T13:17:44.653

Modified: 2026-08-13T16:17:56.420

Link: CVE-2026-14672

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T14:45:03Z

Weaknesses