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CVE-2026-14672

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 5.3 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system · database

Affected products and versions

  • postgresql

    Versions
    • ≥ 18, < 18.6: Affected (rpm)
    • ≥ 17, < 17.11: Affected (rpm)
    • ≥ 16, < 16.15: Affected (rpm)

    Update to 16.15; Update to 17.11; Update to 18.6

  • postgresql-17 Debian:13

    Versions
    • 17.10-0+deb13u1
    • 17.5-1
    • 17.6-0+deb13u1
    • 17.6-1
    • 17.7-0+deb13u1
    • 17.8-0+deb13u1
    • 17.9-0+deb13u1
    Affected ranges
    • ECOSYSTEM: < 17.11-0+deb13u1

    Update to 17.11-0+deb13u1

  • postgresql-18 Debian:14

    Versions
    • 18.0-1
    • 18.1-1
    • 18.1-2
    • 18.2-1
    • 18.3-1
    • 18.4-1
    • 18~beta1+20250612-1
    • 18~beta1+20250624-1
    • 18~beta1+20250701-1
    • 18~beta1-1
    • 18~beta2-1
    • 18~beta3-1
    • 18~rc1-1
    • 18~rc1-2
    • 18~rc1-3
    • 18~~devel.20250318+g4078da6c478-1
    • 18~~devel.20250331-1
    • 18~~devel.20250405-1
    • 18~~devel.20250421-1
    • 18~~devel.20250502-1
    Affected ranges
    • ECOSYSTEM: < 18.6-1

    Update to 18.6-1

  • postgresql-9.3 Ubuntu:Pro:14.04:LTS

    Versions
    • 9.3.1-1
    • 9.3.2-1
    • 9.3.2-1ubuntu1
    • 9.3.2-1ubuntu2
    • 9.3.3-1
    • 9.3.3-1bzr1
    • 9.3.3-1bzr2
    • 9.3.4-1
    • 9.3.5-0ubuntu0.14.04.1
    • 9.3.6-0ubuntu0.14.04
    • 9.3.7-0ubuntu0.14.04
    • 9.3.8-0ubuntu0.4.04
    • 9.3.9-0ubuntu0.14.04
    • 9.3.10-0ubuntu0.14.04
    • 9.3.11-0ubuntu0.14.04
    • 9.3.12-0ubuntu0.14.04
    • 9.3.13-0ubuntu0.14.04
    • 9.3.14-0ubuntu0.14.04
    • 9.3.15-0ubuntu0.14.04
    • 9.3.16-0ubuntu0.14.04
    • 9.3.17-0ubuntu0.14.04
    • 9.3.18-0ubuntu0.14.04.1
    • 9.3.19-0ubuntu0.14.04
    • 9.3.20-0ubuntu0.14.04
    • 9.3.21-0ubuntu0.14.04
    • 9.3.22-0ubuntu0.14.04
    • 9.3.23-0ubuntu0.14.04
    • 9.3.24-0ubuntu0.14.04
    • 9.3.24-0ubuntu0.14.04+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • postgresql-16 Ubuntu:24.04:LTS

    Versions
    • 16.0-2
    • 16.1-1
    • 16.1-1build1
    • 16.1-1build3
    • 16.2-1
    • 16.2-1ubuntu2
    • 16.2-1ubuntu3
    • 16.2-1ubuntu4
    • 16.3-0ubuntu0.24.04.1
    • 16.4-0ubuntu0.24.04.1
    • 16.4-0ubuntu0.24.04.2
    • 16.6-0ubuntu0.24.04.1
    • 16.8-0ubuntu0.24.04.1
    • 16.9-0ubuntu0.24.04.1
    • 16.10-0ubuntu0.24.04.1
    • 16.11-0ubuntu0.24.04.1
    • 16.13-0ubuntu0.24.04.1
    • 16.14-0ubuntu0.24.04.1
    Affected ranges
    • ECOSYSTEM: < 16.15-0ubuntu0.24.04.1

    Update to 16.15-0ubuntu0.24.04.1

  • postgresql-18 Ubuntu:26.04:LTS

    Versions
    • 18.0-1
    • 18.1-1
    • 18.1-1ubuntu1
    • 18.1-1ubuntu2
    • 18.1-2
    • 18.3-1
    • 18.4-0ubuntu0.26.04.1
    Affected ranges
    • ECOSYSTEM: < 18.6-0ubuntu0.26.04.1

    Update to 18.6-0ubuntu0.26.04.1

Original sources

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