Use after free in PostgreSQL plperl allows an object creator to execute arbitrary code as the operating system user running the database, via dropping the final reference to a Perl array or hash while PostgreSQL is converting that object. Versions before PostgreSQL 18.7, 17.12, 16.16, 15.20, and 14.25 are affected.
https://www.postgresql.org/support/security/CVE-2026-116320/