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

Affected: PostgreSQL

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.

USN-8653-1 — postgresql-14, postgresql-16, postgresql-18 vulnerabilities

Affected: Ubuntu:22.04:LTS: postgresql-14, Ubuntu:24.04:LTS: postgresql-16, Ubuntu:26.04:LTS: postgresql-18

It was discovered that PostgreSQL incorrectly handled COPY FROM STDIN when an early failure occurred. An authenticated user could possibly use this issue to execute arbitrary SQL commands. (CVE-2026-6464)

It was discovered that PostgreSQL incorrectly reset extended statistics ownership during ALTER TABLE ALTER TYPE operations. An attacker could possibly use this issue to obtain sensitive information or gain unintended privileges. (CVE-2026-6469)

It was discovered that PostgreSQL failed to check the USAGE privilege on types. An authenticated user could possibly use this issue to obtain sensitive information. (CVE-2026-6470)

It was discovered that PostgreSQL logical decoding could load arbitrary shared libraries. An authenticated user could possibly use this issue to execute arbitrary code. (CVE-2026-6471)

It was discovered that PostgreSQL had integer wraparound issues in tsvector and tsquery allocations. An authenticated user could possibly use this issue to execute arbitrary code. (CVE-2026-14662)

It was discovered that PostgreSQL pgcrypto silently used cleartext when OpenSSL-disabled ciphers were requested. An authenticated user could possibly use this issue to obtain sensitive information. (CVE-2026-14663)

It was discovered that PostgreSQL had a heap buffer overflow in regular expression processing. An authenticated user could possibly use this issue to execute arbitrary code. (CVE-2026-14664)

It was discovered that PostgreSQL row security policies were not properly…

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

USN-8653-1 — postgresql-14, postgresql-16, postgresql-18 vulnerabilities