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
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| 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
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
- 3
- First → latest
- 11.2025 06.2026
- Without a fix
- 3
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 2
Disclosures per year
- 2025: 2
- 2026: 1
-
expr-eval does not restrict functions passed to the evaluate function this entry
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