CVE-2026-6475
Description
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.
How to fix
- postgresql postgresql14.23, 15.18, 16.14, 17.10, 18.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| postgresql postgresql | v < 14.23, 15.0 ≤ v < 15.18, 16.0 ≤ v < 16.14, 17.0 ≤ v < 17.10, 18.0 ≤ v < 18.4 | 14.23, 15.18, 16.14, 17.10, 18.4 |
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Attack Surface Management
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