CVE-2025-57323: Regularjs Mpregular

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

mpregular is a package that provides a small program development framework based on RegularJS. A Prototype Pollution vulnerability in the mp.addEventHandler function of mpregular version 0.2.0 and before allows attackers to inject properties on Object.prototype via supplying a crafted payload, causing denial of service (DoS) as the minimum consequence.

Affected products

• Regularjs Mpregular: up to and including 0.2.0

Published 2025-09-24. Last modified 2026-06-17.