CVE-2026-40897

Description

Math.js is an extensive math library for JavaScript and Node.js. From 13.1.1 to before 15.2.0, a vulnerability allowed executing arbitrary JavaScript via the expression parser of mathjs. You can be affected when you have an application where users can evaluate arbitrary expressions using the mathjs expression parser. This vulnerability is fixed in 15.2.0.

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CVSS v3.1 Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0005

Probability of exploitation

0.14%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-915 CWE-915

Affected Products

Vendor	Product	Versions
mathjs	mathjs	13.1.1 — 15.2.0

References

Advisories & Patches

https://github.com/josdejong/mathjs/commit/513ab2a0e01004af91b31aada68fae8a821326ad https://github.com/josdejong/mathjs/security/advisories/GHSA-29qv-4j9f-fjw5

Other References

https://github.com/josdejong/mathjs/pull/3656

Frequently Asked Questions

What is CVE-2026-40897? +

Math.js is an extensive math library for JavaScript and Node.js. From 13.1.1 to before 15.2.0, a vulnerability allowed executing arbitrary JavaScript via the expression parser of mathjs. You can be affected when you have an application where users can evaluate arbitrary expressions using the mathjs expression parser. This vulnerability is fixed in 15.2.0. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-40897? +

CVE-2026-40897 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0005, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-40897? +

CVE-2026-40897 affects products from mathjs, specifically: mathjs. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-40897? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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