CVE-2026-6475 Affecting postgresql-17 package, versions <17.10-0ubuntu0.25.10.1


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.32% (24th percentile)

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  • Snyk IDSNYK-UBUNTU2510-POSTGRESQL17-16782078
  • published22 May 2026
  • disclosed14 May 2026

Introduced: 14 May 2026

CVE-2026-6475  (opens in a new tab)

How to fix?

Upgrade Ubuntu:25.10 postgresql-17 to version 17.10-0ubuntu0.25.10.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream postgresql-17 package and not the postgresql-17 package as distributed by Ubuntu. See How to fix? for Ubuntu:25.10 relevant fixed versions and status.

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 Base Scores

version 3.1