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Vulnerability record · CVE-2025-13204 · published 14 November 2025

CVE-2025-13204: Silentmatt javascript expression evaluator prototype pollution vulnerability

Silentmatt · Javascript Expression Evaluator

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.

7.3 CVSS 3.1 High EPSS 0.45% · top 63.3% CWE-1321 · Prototype pollution
7.3CVSS 3.1 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/SECCON/SECCON2022_final_CTF/blob/main/jeopardy/web/babybox/solver/solver.py Product
https://github.com/jorenbroekema/expr-eval Product
https://github.com/silentmatt/expr-eval Product
https://github.com/silentmatt/expr-eval/pull/252/files Issue TrackingPatch
https://github.com/vladko312/extras/blob/f549d505af300fd74a01b46fab2102990ff1c14d/expr-eval.py Product
https://www.huntr.dev/bounties/1-npm-expr-eval/ ExploitThird Party Advisory
https://www.npmjs.com/package/expr-eval-fork Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-12735Jorenbroekema javascript expression evaluator code injection vulnerabilityThe expr-eval library is a JavaScript expression parser and evaluator designed to safely evaluate mathematical expressions with user-defined variable…EPSS 2.3%8.6CVE-2026-34621Adobe Acrobat Reader prototype pollution leads to code executionAdobe Acrobat and Reader (versions 24.001.30356, 26.001.21367 and earlier) are affected by prototype pollution (CWE-1321) that can result in arbitrar…KEVEPSS 2.2%analysed

Source: NIST National Vulnerability Database (record CVE-2025-13204), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.