eslint up to 9.25.x serialization.js RuleTester.run stack-based overflow

Summaryinfo

A vulnerability, which was classified as critical, has been found in eslint up to 9.25.x. Impacted is the function RuleTester.run in the library eslint/lib/shared/serialization.js. The manipulation leads to stack-based overflow. This vulnerability is referenced as CVE-2025-50537. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in eslint up to 9.25.x. This issue affects the function RuleTester.run in the library eslint/lib/shared/serialization.js. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-50537 since 06/16/2025. The exploitation is known to be easy. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 296662 (Linux Distros Unpatched Vulnerability : CVE-2025-50537), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.26.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (296662). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• eslint

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6
• 9.7
• 9.8
• 9.9
• 9.10
• 9.11
• 9.12
• 9.13
• 9.14
• 9.15
• 9.16
• 9.17
• 9.18
• 9.19
• 9.20
• 9.21
• 9.22
• 9.23
• 9.24
• 9.25

Website

• Product: https://github.com/eslint/eslint/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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