CVE-2026-18408
Last modified
CVE-2026-18408 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Untrusted data inclusion in pg_dump in PostgreSQL allows a malicious superuser of the origin server to inject arbitrary code for restore-time execution as the client operating system account running psql to restore the dump, via psql \restrict meta-command input expansion. The fix for CVE-2025-8714 introduced \restrict and \unrestrict to block this attack, but \unrestrict itself was sufficient for an attack. EPSS estimates a 0.36% chance of exploitation in the next 30 days.
Description
Untrusted data inclusion in pg_dump in PostgreSQL allows a malicious superuser of the origin server to inject arbitrary code for restore-time execution as the client operating system account running psql to restore the dump, via psql \restrict meta-command input expansion. The fix for CVE-2025-8714 introduced \restrict and \unrestrict to block this attack, but \unrestrict itself was sufficient for an attack. pg_dumpall is also affected. pg_restore is affected when used to generate a plain-format dump. Non-core use of \restrict would be affected, but we've not identified non-core use. Versions before PostgreSQL 18.6, 17.11, 16.15, 15.19, and 14.24 are affected.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Postgresql | Postgresql | >= 14.0, < 14.24 |
| Postgresql | Postgresql | >= 15.0, < 15.19 |
| Postgresql | Postgresql | >= 16.0, < 16.15 |
| Postgresql | Postgresql | >= 17.0, < 17.11 |
| Postgresql | Postgresql | >= 18.0, < 18.5 |
References
- https://www.postgresql.org/support/security/CVE-2026-18408/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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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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