CVE-2025-12735

high

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 variables object into the evaluate() function and trigger arbitrary code execution.

https://www.bleepingcomputer.com/news/security/popular-javascript-library-expr-eval-vulnerable-to-rce-flaw/

https://kb.cert.org/vuls/id/263614

https://www.npmjs.com/package/expr-eval-fork

https://www.npmjs.com/package/expr-eval

https://www.kb.cert.org/vuls/id/263614

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

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

https://github.com/jorenbroekema/expr-eval/blob/460b820ba01c5aca6c5d84a7d4f1fa5d1913c67b/test/security.js

https://github.com/jorenbroekema/expr-eval

Details

Source: Mitre, NVD

Published: 2025-11-05

Updated: 2025-11-10

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

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

Severity: Critical

CVSS v4

Base Score: 8.6

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

Severity: High

EPSS

EPSS: 0.00078

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability Being Monitored

Detections

Analytics