CVE-2026-18408 [HIGH] – Untrusted data inclusion in pg_dump in PostgreSQL allows a malicious superuser of the orig

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.