CVE-2025-43919 Path traversal in Mailman
Unauthenticated attackers may read arbitrary files via directory traversal in the Mailman private archive endpoint, though reproduction is disputed.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-43919?
CVE-2025-43919 is a medium-severity path traversal vulnerability in GNU Mailman, published on 20 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2025-43919?
It affects 1 product.
Products include Gnu Mailman.
How do I fix CVE-2025-43919?
No fix has been published for CVE-2025-43919 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2025-43919 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-43919 exists.
Public exploit code: 2 proofs of concept on GitHub.
Other vulnerabilities in GNU Mailman
Sources
Also known as GHSA-56r4-vj3r-h3vv.