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CVE-2025-12735

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Date: November 4, 2025

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 context object or use MEMBER of the context object into the evaluate() function and trigger arbitrary code execution.

Severity Score

Related Resources (13)

https://github.com/silentmatt/expr-eval/pull/289
https://github.com/silentmatt/expr-eval
https://github.com/advisories/GHSA-jc85-fpwf-qm7x
https://kb.cert.org/vuls/id/263614
https://github.com/jorenbroekema/expr-eval/blob/460b820ba01c5aca6c5d84a7d4f1fa5d1913c67b/test/security.js
https://www.kb.cert.org/vuls/id/263614
https://nvd.nist.gov/vuln/detail/CVE-2025-12735
https://www.npmjs.com/package/expr-eval-fork
https://github.com/jorenbroekema/expr-eval
https://www.npmjs.com/package/expr-eval
https://github.com/silentmatt/expr-eval/pull/288
https://github.com/jorenbroekema/expr-eval/commit/1d71bb2ca8f98df8de00e9cc4de8fdd468a7ad43
https://www.mend.io/vulnerability-database/CVE-2025-12735

Severity Score

Weakness Type (CWE)

Improper Control of Generation of Code ('Code Injection')

CWE-94

Improper Input Validation

CWE-20

Top Fix

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Upgrade to version expr-eval-fork - 3.0.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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