CVE-2025-13204

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 v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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 Tracking Patch
https://github.com/vladko312/extras/blob/f549d505af300fd74a01b46fab2102990ff1c14d/expr-eval.py	Product
https://www.huntr.dev/bounties/1-npm-expr-eval/	Exploit Third Party Advisory
https://www.npmjs.com/package/expr-eval-fork	Product

Configurations

Configuration 1 (hide)

cpe:2.3:a:silentmatt:javascript_expression_evaluator:*:*:*:*:*:node.js:*:*

History

30 Oct 2026, 19:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~7.3~~	v2 : unknown v3 : 9.8

07 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) El paquete npm 'expr-eval' es vulnerable a la Contaminación de Prototipos. Un atacante con acceso a la interfaz de evaluación de expresiones puede usar el modelo de herencia basado en prototipos de JavaScript para lograr la ejecución de código arbitrario. El paquete npm 'expr-eval-fork' resuelve este problema.

Information

Published : 2025-11-14 17:16

Updated : 2026-10-30 19:17

NVD link : CVE-2025-13204

Mitre link : CVE-2025-13204

CVE.ORG link : CVE-2025-13204

JSON object : View

Products Affected

silentmatt

javascript_expression_evaluator

CWE

CWE-1321

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

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