CVE-2025-11175 DiscussionTools should use better regex
Attackers can cause denial of service via exponential blowup in DiscussionTools regex, affecting MediaWiki installations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-11175?
CVE-2025-11175 is a high-severity denial of service vulnerability in The Wikimedia Foundation Mediawiki - DiscussionTools Extension, published on 30 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') vulnerability in The Wikimedia Foundation Mediawiki - DiscussionTools Extension allows Regular Expression Exponential Blowup.This issue affects Mediawiki - DiscussionTools Extension: 1.44, 1.43.
Weakness: CWE-917
Which versions are affected by CVE-2025-11175?
How do I fix CVE-2025-11175?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-11175 being exploited?
There is no known exploitation of CVE-2025-11175 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-11175, GHSA-2jhx-qqh2-9q63, UBUNTU-CVE-2025-11175.