BaseFortify

Publication date: 2025-11-14

Last updated on: 2025-11-18

Assigner: CERT/CC

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2025-11-14

Last Modified

2025-11-18

Generated

2026-07-06

AI Q&A

2025-11-14

EPSS Evaluated

2026-07-05

NVD

CVE-2025-13204

Affected Vendors & Products

Vendor	Product	Version / Range
silentmatt	expr-eval	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1321	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.

Attack-Flow Graph

Mitigation Strategies

To mitigate this vulnerability, you should replace the vulnerable npm package `expr-eval` with the patched version available in the `expr-eval-fork` package.

Executive Summary

The vulnerability in the npm package `expr-eval` is a Prototype Pollution issue. This means an attacker who can access the expression evaluation interface can manipulate JavaScript's prototype-based inheritance to execute arbitrary code.

Impact Analysis

This vulnerability can allow an attacker to execute arbitrary code on your system if they have access to the expression evaluation interface, potentially leading to unauthorized actions or system compromise.

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