PostgreSQL Inclusion of Functionality from Untrusted Control Sphere Vulnerability - CVE-2026-18408

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 we39ve not identified non-core use. Versions before PostgreSQL 18.5 17.11 16.15 15.19 and 14.24 are affected.