CVE-2026-18408: PostgreSQL

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• PostgreSQL PostgreSQL: from 14.0, before 14.24 (fixed in 14.24); from 15.0, before 15.19 (fixed in 15.19); from 16.0, before 16.15 (fixed in 16.15); from 17.0, before 17.11 (fixed in 17.11); from 18.0, before 18.5 (fixed in 18.5)

Published 2026-08-13. Last modified 2026-08-29.