Medium [CVE-2026-6475] Operating system account hijack via symlink following in pg_basebackup and pg_rewind
This medium-severity Red Hat Linux advisory covers CVE-2026-6475 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 1.
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Summary
Operating system account hijack via symlink following in pg_basebackup and pg_rewind. Red Hat rates this moderate (CVSS 6.7).
Weakness: CWE-59. Affected package(s): postgresql, postgresql:12, postgresql:18, postgresql:15, libpq, postgresql16.
Resolved in Red Hat advisory RHSA-2026:26561 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
- postgresql-0:13.23-1.el9_4.2
- postgresql:12-8080020260626093604.63b34585
- postgresql-0:13.23-1.el9_2.2
- postgresql:18-9080020260605125734.rhel9
- postgresql:15-9040020260616071806.rhel9
- postgresql-0:13.23-1.el9_6.2
- libpq-0:13.23-1.el8_8.1
- postgresql:15-9080020260605124405.rhel9
- postgresql:15-9060020260622062902.rhel9
- postgresql-0:13.23-3.el9_8
- postgresql16-0:16.14-1.el10_2
- postgresql:15-8100020260605152259.489197e6
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:26561
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:26561 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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