expr-eval does not restrict functions passed to the evaluate function
The expr-eval library is a JavaScript expression parser and evaluator designed to safely evaluate mathematical expressions with user-defined variables. However, due to insufficient input validation, an attacker can pass a crafted variables object into the evaluate() function and trigger arbitrary code execution.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | expr-eval | <= 2.0.2 | no fix |
| npm package | expr-eval-fork | < 3.0.1 | 3.0.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-12735
- https://github.com/silentmatt/expr-eval/pull/288
- https://github.com/silentmatt/expr-eval/pull/289
- https://github.com/jorenbroekema/expr-eval/commit/1d71bb2ca8f98df8de00e9cc4de8fdd468a7ad43
- https://github.com/jorenbroekema/expr-eval
- https://github.com/jorenbroekema/expr-eval/blob/460b820ba01c5aca6c5d84a7d4f1fa5d1913c67b/test/security.js
- https://github.com/silentmatt/expr-eval
- https://kb.cert.org/vuls/id/263614
- https://www.kb.cert.org/vuls/id/263614
- https://www.npmjs.com/package/expr-eval
- https://www.npmjs.com/package/expr-eval-fork
- CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-94- Platform
- npm
- Package
expr-eval, expr-eval-fork- Disclosed
- 05.11.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-jc85-fpwf-qm7x - CC BY 4.0
Vulnerability history: expr-eval-fork
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 11.2025 11.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
Disclosures per year
- 2025: 2
- 2026: 0
-
expr-eval does not restrict functions passed to the evaluate function this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.