CVE-2026-116326 PostgreSQL plperl tied-object exceptions follow stale sigjmp_buf

This vulnerability is rated as Important severity because an authenticated database user with privileges to execute or define PL/Perl functions could achieve arbitrary code execution within the context of the PostgreSQL backend process. However, the PL/Perl procedural language is an optional component that is not enabled by default on standard Red Hat Enterprise Linux PostgreSQL deployments. Environments that do not install the optional plperl subpackage or grant untrusted users access to PL/Perl are not exposed to this flaw.

Disable or restrict access to the PL/Perl extension in affected databases, or remove the optional PL/Perl package if not required.

1. Restrict PL/Perl language usage from untrusted database roles:

```sql

REVOKE USAGE ON LANGUAGE plperl FROM PUBLIC;

REVOKE USAGE ON LANGUAGE plperlu FROM PUBLIC;

```

2. If PL/Perl is not required, drop the extension from affected databases:

```sql

DROP EXTENSION IF EXISTS plperl CASCADE;

DROP EXTENSION IF EXISTS plperlu CASCADE;

```

3. Optionally, remove the RPM package providing the language integration:

```bash

dnf remove postgresql-plperl

```

Caveats:

Revoking access or dropping the extension will break existing database stored procedures and functions that rely on PL/Perl.

Warning:

Database-level privilege and extension changes do not require restarting the postgresql service, but active client sessions should be terminated to enforce privilege revocations immediately.