CVE-2025-43919: GNU Mailman

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to read arbitrary files via ../ directory traversal at /mailman/private/mailman (aka the private archive authentication endpoint) via the username parameter. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.

Affected products

• GNU Mailman: from 2.1.1, up to and including 2.1.39

Published 2025-04-20. Last modified 2026-06-17.