CVE-2025-50537 Denial of service in n/a
An attacker can cause a stack overflow and denial of service in ESLint by providing objects with circular references during rule testing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-50537?
CVE-2025-50537 is a medium-severity denial of service vulnerability in n/a, published on 26 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Stack overflow vulnerability in eslint before 9.26.0 when serializing objects with circular references in eslint/lib/shared/serialization.js. The exploit is triggered via the RuleTester.run() method, which validates test cases and checks for duplicates. During validation, the internal function checkDuplicateTestCase() is called, which in turn uses the isSerializable() function for serialization checks. When a circular reference object is passed in, isSerializable() enters infinite recursion, ultimately causing a stack overflow.
Weakness: CWE-674
Which versions are affected by CVE-2025-50537?
It affects 1 product.
Products include Openjsf Eslint.
How do I fix CVE-2025-50537?
Upgrade to a fixed version.
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-2025-50537 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-50537 exists.
Sources
Also known as MINI-4j9p-5c8c-3338, MINI-9r6r-cv27-vf5r, MINI-r248-vcpg-rwjr, MINI-w6vx-g9wp-c2hg, MINI-w9rh-h6x7-h6qr, ROOT-APP-NPM-CVE-2025-50537 and 1 more.