CVE-2025-12735

Description

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.

CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-94 CWE-94

Affected Products

Vendor	Product	Versions
jorenbroekema	javascript_expression_evaluator	All
silentmatt	javascript_expression_evaluator	< 2.0.2

References

Advisories & Patches

https://github.com/silentmatt/expr-eval/pull/288

Other References

https://github.com/advisories/GHSA-jc85-fpwf-qm7x https://github.com/jorenbroekema/expr-eval https://github.com/silentmatt/expr-eval https://kb.cert.org/vuls/id/263614 https://www.npmjs.com/package/expr-eval https://www.npmjs.com/package/expr-eval-fork https://www.kb.cert.org/vuls/id/263614 https://github.com/jorenbroekema/expr-eval/blob/460b820ba01c5aca6c5d84a7d4f1fa5d1913c67b/test/security.js

Frequently Asked Questions

What is CVE-2025-12735? +

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-12735? +

CVE-2025-12735 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-12735? +

CVE-2025-12735 affects products from jorenbroekema, silentmatt, specifically: javascript_expression_evaluator. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-12735? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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