CVE-2025-61766 Bucket vulnerable to infinite recursion when querying a bucket using the != operator
Attackers can cause denial of service in MediaWiki Bucket extension by triggering infinite recursion via the != operator in queries.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-61766?
CVE-2025-61766 is a medium-severity denial of service vulnerability in weirdgloop mediawiki-extensions-Bucket, published on 6 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Bucket is a MediaWiki extension to store and retrieve structured data on articles. Prior to version 1.0.0, infinite recursion can occur if a user queries a bucket using the `!=` comparator. This will result in PHP's call stack limit exceeding, and/or increased memory consumption, potentially leading to a denial of service. Version 1.0.0 contains a patch for the issue.
Weakness: CWE-674
Which versions are affected by CVE-2025-61766?
How do I fix CVE-2025-61766?
No fix has been published for CVE-2025-61766 yet. Limit exposure of the affected software until one is available.
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-2025-61766 being exploited?
There is no known exploitation of CVE-2025-61766 in the wild and no public exploit code.
Sources
Also known as GHSA-r9f2-4jh3-659j, UBUNTU-CVE-2025-61766.