CVE-2026-40897
Math.js: Unsafe object property setter in mathjs
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Math.js: Unsafe object property setter in mathjs
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.
- Record
CVE-2026-40897- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-915, CWE-917
- Updated
- 2026-11-02
EUVDEUVD-2026-25571
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.
- Record
EUVD-2026-25571- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-29qv-4j9f-fjw5
Unsafe object property setter in mathjs
Impact
This security 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.
Patches
The issue was introduced in mathjs v13.1.1, and patched in mathjs v15.2.0.
Workarounds
There is no workaround without upgrading to v15.2.0.
References
You can find out more via the commit fixing this issue: https://github.com/josdejong/mathjs/commit/513ab2a0e01004af91b31aada68fae8a821326ad (part of PR https://github.com/josdejong/mathjs/pull/3656).
- Record
GHSA-29qv-4j9f-fjw5- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-915
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-40897- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-915, CWE-917
- Updated
- 2026-11-02
OSV
Math.js: Unsafe object property setter in mathjs
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.
- Record
CVE-2026-40897- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-915
- Updated
- 2026-11-02
OSVGHSA-29qv-4j9f-fjw5
Unsafe object property setter in mathjs
Impact
This security 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.
Patches
The issue was introduced in mathjs v13.1.1, and patched in mathjs v15.2.0.
Workarounds
There is no workaround without upgrading to v15.2.0.
References
You can find out more via the commit fixing this issue: https://github.com/josdejong/mathjs/commit/513ab2a0e01004af91b31aada68fae8a821326ad (part of PR https://github.com/josdejong/mathjs/pull/3656).
- Record
GHSA-29qv-4j9f-fjw5- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-915
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
mathjsnpm |
13.1.1 up to 15.2.0 | 15.2.0 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | EQSTLab/CVE-2026-40897 | 2026-05-07 |
| PoC in GitHub | yym8538/CVE-2026-40897 | 2026-08-21 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-40897 is a high vulnerability (CVSS 8.8) in Josdejong Mathjs, published April 16, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 46th percentile. Fixed in mathjs 15.2.0.
References
github.com/josdejong/mathjs/security/advisories/GHSA-29qv-4j9f-fjw5
access.redhat.com/security/cve/CVE-2026-40897
bugzilla.redhat.com/show_bug.cgi?id=2461612
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40897.json