CVE-2026-18408 - PostgreSQL psql \unrestrict lets superuser of pg_dump origin server execute arbitrary code in psql client

CVE-2026-18408 - PostgreSQL psql \unrestrict lets superuser of pg_dump origin server execute arbitrary code in psql client

https://cvefeed.io/rssfeed/latest.atom / Thu, 08/13/2026 - 16:26
CVE ID :CVE-2026-18408
Published : Aug. 13, 2026, 1 p.m. | 28 minutes ago
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 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.
Severity: 8.8 | HIGH
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