CVE-2025-43919: gnu mailman Path Traversal: '../filedir'

Vulnerability summary

CVE-2025-43919 is a high (CVSS 7.5) Path Traversal: '../filedir' vulnerability in gnu mailman. EPSS estimates a 1.38% chance of exploitation in the next 30 days, higher than 71.6% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 20-04-2025
   PublishedVulnerability first disclosed.
2. 28-04-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-24Path Traversal: '../filedir'The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize "../" sequences that can resolve to a location that is outside of that directory.
• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.