CVE-2026-6475
Last modified
CVE-2026-6475 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 0.32% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Postgresql | Postgresql | < 14.23 |
| Postgresql | Postgresql | >= 15.0, < 15.18 |
| Postgresql | Postgresql | >= 16.0, < 16.14 |
| Postgresql | Postgresql | >= 17.0, < 17.10 |
| Postgresql | Postgresql | >= 18.0, < 18.4 |
References
- https://www.postgresql.org/support/security/CVE-2026-6475/Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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