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CVE-2026-6475

CVE-2026-6475 · PostgreSQL pg_basebackup and pg_rewind can overwrite unrelated files of origin superuser choice

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

Symlink following in PostgreSQL pg_basebackup plain format and in pg_rewind allows an origin superuser to overwrite local files, e.g. /var/lib/postgres/.bashrc, that hijack the operating system account. It will remain the case that starting the server after these commands implicitly trusts the origin superuser, due to features like shared_preload_libraries. Hence, the attack has practical implications only if one takes relevant action between these commands and server start, like moving the files to a different VM or snapshotting the VM. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

CVSS 8.8 · High · EPSS 0.3% · Fix available

Published
Updated

Stack: system · database

Affected products and versions

  • postgresql

    Versions
    • ≥ 18, < 18.4: Affected (rpm)
    • ≥ 17, < 17.10: Affected (rpm)
    • ≥ 16, < 16.14: Affected (rpm)
    • ≥ 15, < 15.18: Affected (rpm)
    • ≥ 0, < 14.23: Affected (rpm)

    Update to 14.23; Update to 15.18; Update to 16.14; Update to 17.10; Update to 18.4

  • postgresql-15 Debian:12

    Versions
    • 15.10-0+deb12u1
    • 15.11-0+deb12u1
    • 15.12-0+deb12u1
    • 15.12-0+deb12u2
    • 15.13-0+deb12u1
    • 15.14-0+deb12u1
    • 15.15-0+deb12u1
    • 15.16-0+deb12u1
    • 15.17-0+deb12u1
    • 15.3-0+deb12u1
    • 15.3-1
    • 15.4-0+deb12u1
    • 15.4-1
    • 15.4-2
    • 15.4-3
    • 15.5-0+deb12u1
    • 15.6-0+deb12u1
    • 15.7-0+deb12u1
    • 15.8-0+deb12u1
    • 15.9-0+deb12u1
    Affected ranges
    • ECOSYSTEM: < 15.18-0+deb12u1

    Update to 15.18-0+deb12u1

  • postgresql-17 Debian:13

    Versions
    • 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: < 17.10-0+deb13u1

    Update to 17.10-0+deb13u1

  • postgresql-18 Debian:14

    Versions
    • 18.0-1
    • 18.1-1
    • 18.1-2
    • 18.2-1
    • 18.3-1
    • 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: < 18.4-1

    Update to 18.4-1

  • 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-9.5 Ubuntu:Pro:16.04:LTS

    Versions
    • 9.5.0-1
    • 9.5.0-2
    • 9.5.0-3
    • 9.5.1-1
    • 9.5.2-1
    • 9.5.3-0ubuntu0.16.04
    • 9.5.4-0ubuntu0.16.04
    • 9.5.5-0ubuntu0.16.04
    • 9.5.6-0ubuntu0.16.04
    • 9.5.7-0ubuntu0.16.04
    • 9.5.8-0ubuntu0.16.04.1
    • 9.5.9-0ubuntu0.16.04
    • 9.5.10-0ubuntu0.16.04
    • 9.5.11-0ubuntu0.16.04
    • 9.5.12-0ubuntu0.16.04
    • 9.5.13-0ubuntu0.16.04
    • 9.5.14-0ubuntu0.16.04
    • 9.5.16-0ubuntu0.16.04.1
    • 9.5.17-0ubuntu0.16.04.1
    • 9.5.18-0ubuntu0.16.04.1
    • 9.5.19-0ubuntu0.16.04.1
    • 9.5.21-0ubuntu0.16.04.1
    • 9.5.23-0ubuntu0.16.04.1
    • 9.5.24-0ubuntu0.16.04.1
    • 9.5.25-0ubuntu0.16.04.1
    • 9.5.25-0ubuntu0.16.04.1+esm1
    • 9.5.25-0ubuntu0.16.04.1+esm2
    • 9.5.25-0ubuntu0.16.04.1+esm3
    • 9.5.25-0ubuntu0.16.04.1+esm4
    • 9.5.25-0ubuntu0.16.04.1+esm5
    • 9.5.25-0ubuntu0.16.04.1+esm6
    • 9.5.25-0ubuntu0.16.04.1+esm7
    • 9.5.25-0ubuntu0.16.04.1+esm8
    • 9.5.25-0ubuntu0.16.04.1+esm10
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • postgresql-10 Ubuntu:Pro:18.04:LTS

    Versions
    • 10.1-1
    • 10.1-2
    • 10.2-1
    • 10.3-1
    • 10.4-0ubuntu0.18.04
    • 10.5-0ubuntu0.18.04
    • 10.6-0ubuntu0.18.04.1
    • 10.7-0ubuntu0.18.04.1
    • 10.8-0ubuntu0.18.04.1
    • 10.9-0ubuntu0.18.04.1
    • 10.10-0ubuntu0.18.04.1
    • 10.12-0ubuntu0.18.04.1
    • 10.14-0ubuntu0.18.04.1
    • 10.15-0ubuntu0.18.04.1
    • 10.16-0ubuntu0.18.04.1
    • 10.17-0ubuntu0.18.04.1
    • 10.18-0ubuntu0.18.04.1
    • 10.19-0ubuntu0.18.04.1
    • 10.20-0ubuntu0.18.04.1
    • 10.21-0ubuntu0.18.04.1
    • 10.22-0ubuntu0.18.04.1
    • 10.23-0ubuntu0.18.04.1
    • 10.23-0ubuntu0.18.04.2
    • 10.23-0ubuntu0.18.04.2+esm1
    • 10.23-0ubuntu0.18.04.2+esm2
    • 10.23-0ubuntu0.18.04.2+esm3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • postgresql-12 Ubuntu:20.04:LTS

    Versions
    • 12.0-1
    • 12.1-1
    • 12.1-2build1
    • 12.2-1
    • 12.2-1ubuntu2
    • 12.2-4
    • 12.4-0ubuntu0.20.04.1
    • 12.5-0ubuntu0.20.04.1
    • 12.6-0ubuntu0.20.04.1
    • 12.7-0ubuntu0.20.04.1
    • 12.8-0ubuntu0.20.04.1
    • 12.9-0ubuntu0.20.04.1
    • 12.10-0ubuntu0.20.04.1
    • 12.11-0ubuntu0.20.04.1
    • 12.12-0ubuntu0.20.04.1
    • 12.13-0ubuntu0.20.04.1
    • 12.14-0ubuntu0.20.04.1
    • 12.15-0ubuntu0.20.04.1
    • 12.16-0ubuntu0.20.04.1
    • 12.17-0ubuntu0.20.04.1
    • 12.18-0ubuntu0.20.04.1
    • 12.19-0ubuntu0.20.04.1
    • 12.20-0ubuntu0.20.04.1
    • 12.22-0ubuntu0.20.04.1
    • 12.22-0ubuntu0.20.04.2
    • 12.22-0ubuntu0.20.04.4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • postgresql-14 Ubuntu:22.04:LTS

    Versions
    • 14.1-1ubuntu1
    • 14.2-1
    • 14.2-1ubuntu1
    • 14.3-0ubuntu0.22.04.1
    • 14.4-0ubuntu0.22.04.1
    • 14.5-0ubuntu0.22.04.1
    • 14.6-0ubuntu0.22.04.1
    • 14.7-0ubuntu0.22.04.1
    • 14.8-0ubuntu0.22.04.1
    • 14.9-0ubuntu0.22.04.1
    • 14.10-0ubuntu0.22.04.1
    • 14.11-0ubuntu0.22.04.1
    • 14.12-0ubuntu0.22.04.1
    • 14.13-0ubuntu0.22.04.1
    • 14.15-0ubuntu0.22.04.1
    • 14.17-0ubuntu0.22.04.1
    • 14.18-0ubuntu0.22.04.1
    • 14.19-0ubuntu0.22.04.1
    • 14.20-0ubuntu0.22.04.1
    • 14.22-0ubuntu0.22.04.1
    Affected ranges
    • ECOSYSTEM: < 14.23-0ubuntu0.22.04.1

    Update to 14.23-0ubuntu0.22.04.1

  • 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
    Affected ranges
    • ECOSYSTEM: < 16.14-0ubuntu0.24.04.1

    Update to 16.14-0ubuntu0.24.04.1

  • postgresql-17 Ubuntu:25.10

    Versions
    • 17.4-1
    • 17.4-2
    • 17.5-1
    • 17.5-1build1
    • 17.6-1
    • 17.6-1build1
    • 17.7-0ubuntu0.25.10.1
    • 17.9-0ubuntu0.25.10.1
    Affected ranges
    • ECOSYSTEM: < 17.10-0ubuntu0.25.10.1

    Update to 17.10-0ubuntu0.25.10.1

  • 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
    Affected ranges
    • ECOSYSTEM: < 18.4-0ubuntu0.26.04.1

    Update to 18.4-0ubuntu0.26.04.1

Original sources

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