CVE-2025-13204

Published: Nov 14, 2025Modified: Jun 17, 2026

7.3

Vector

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

Exploitability: 3.9 / Impact: 3.4

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

npm package `expr-eval` is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.

Affected (1)

Products: Silentmatt: Javascript Expression Evaluator

1 product

Javascript Expression Evaluator

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Silentmatt Javascript Expression Evaluator	All versions

Related CWEs

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

References (7)

https://github.com/SECCON/SECCON2022_final_CTF/blob/main/jeopardy/web/babybox/solver/solver.py

Source: cret@cert.org

Product

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

Source: cret@cert.org

Product

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

Source: cret@cert.org

Product

https://github.com/silentmatt/expr-eval/pull/252/files

Source: cret@cert.org

Issue TrackingPatch

https://github.com/vladko312/extras/blob/f549d505af300fd74a01b46fab2102990ff1c14d/expr-eval.py

Source: cret@cert.org

Product

https://www.huntr.dev/bounties/1-npm-expr-eval/

Source: cret@cert.org

ExploitThird Party Advisory

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

Source: cret@cert.org

Product

Timeline

No history available yet.