🛡️ CVE-2025-13204 — expr-eval

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-1321 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

expr-eval vulnerable to Prototype Pollution

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability low.

Weakness class

CVE-2025-13204 is classified as CWE-1321: Prototype Pollution. Attacker input can modify an object prototype, changing behaviour for objects across the application.

Affected software

CVE-2025-13204 is recorded against 3 packages.

  • expr-eval
  • expr-eval-fork
  • javascript-expression-evaluator

Timeline and source

Published on 14 November 2025 and last revised on 4 February 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)
www.huntr.dev (Web)
www.npmjs.com (Web)

CVE-2025-13204 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE CWE-1321
Public Exploit ✅ No
Source NVD
Published 2025-11-14
Updated 2026-08-12
Modified 2026-02-04

Affected Packages

Software From version Fixed in
expr-eval — —
expr-eval-fork — —
javascript-expression-evaluator — —

Site Security Check

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