CVE-2026-40897 josdejong CVE debrief

Who should care

Developers and users of Math.js, especially those who use the library in applications where users can evaluate arbitrary expressions, should be aware of this vulnerability. This includes developers of web applications, Node.js applications, and any other applications that utilize Math.js for mathematical operations. Additionally, security teams and administrators responsible for the security of applications using Math.js should prioritize patching this vulnerability.

Technical summary

The vulnerability in Math.js allows for the execution of arbitrary JavaScript code via its expression parser. This is particularly concerning for applications that allow users to input and evaluate mathematical expressions using Math.js. The vulnerability exists in versions from 13.1.1 up to but not including 15.2.0. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 8.8, categorizing it as high severity. The vulnerability was discovered and reported through GitHub and is tracked under the identifier GHSA-29qv-4j9f-fjw5.

Defensive priority

High priority should be given to patching this vulnerability, especially in applications that allow user-supplied input to be evaluated by Math.js. Immediate action should be taken to upgrade to version 15.2.0 or later to prevent potential exploitation.

Recommended defensive actions

• Upgrade to Math.js version 15.2.0 or later.
• Review applications that use Math.js for mathematical expression evaluation and ensure that user-supplied input is properly sanitized.
• Implement additional security measures such as input validation and sandboxing for applications that cannot be immediately patched.
• Monitor for any suspicious activity that could indicate exploitation attempts.
• Consider using alternative libraries for mathematical operations if patching is not feasible in the short term.

Evidence notes

The evidence for this vulnerability comes from the official CVE record and the NVD detail page. The CVE record provides a brief description of the vulnerability, its impact, and the affected versions of Math.js. The NVD detail page offers additional information, including the CVSS score and vector. GitHub advisories and issue tracking provide further details on the vulnerability and its fix.

Official resources