CVE-2025-13204
Published:November 14, 2025
Updated:November 04, 2026
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 Packages
expr-eval (NPM):
Affected version(s) >=1.2.0 <1.2.3-expr-eval-1.2.5Fix Suggestion:
Update to version 1.2.3-expr-eval-1.2.5expr-eval-fork (NPM):
Affected version(s) =2.0.2 <3.0.0Fix Suggestion:
Update to version 3.0.0Related Resources (12)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improperly Controlled Modification of Object Prototype Attributes
EPSS
Base Score:
0.85