Prototype Pollution Vulnerability in expr-eval Package by npm
CVE-2025-13204
7.3HIGH
Key Information:
- Vendor
Silentmatt
- Status
- Vendor
- CVE Published:
- 14 November 2025
Badges
👾 Exploit Exists🟡 Public PoC
What is CVE-2025-13204?
The expr-eval package, commonly used in npm environments, is vulnerable to a prototype pollution attack. An attacker with access to the express eval interface can manipulate the JavaScript prototype chain, potentially resulting in arbitrary code execution. To mitigate this risk, it is recommended to migrate to the expr-eval-fork package, which addresses this security concern.
Affected Version(s)
expr-eval 0 <= 2.0.2
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.