CVE-2026-40897
From 13.1.1 to before 15.2.0, a vulnerability allowed executing arbitrary JavaScript via the expression parser of mathjs.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.55%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.55% probability · 46th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-915, CWE-917
- Affected
- mathjs/mathjs
- Source
- security-advisories@github.com
EPSS 0.6% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/josdejong/mathjs/commit/513ab2a0e01004af91b31aada68fae8a821326adPatch
- https://github.com/josdejong/mathjs/pull/3656Issue Tracking
- https://github.com/josdejong/mathjs/security/advisories/GHSA-29qv-4j9f-fjw5Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-40897
- https://bugzilla.redhat.com/show_bug.cgi?id=2461612
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40897.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.