GHSA-xx4g-r65p-3qf2

mpregular vulnerable to prototype pollution

Source: GitHub Advisory Database (reviewed) High CVE-2025-57323

Packages

Ecosystem	Package	Affected	Fixed in
npm	mpregular	<= 0.2.0	no fix listed

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2025-57323 advisory
https://github.com/VulnSageAgent/PoCs/blob/main/JavaScript/prototype-pollution/mpregular%400.2.0/index.js web
https://github.com/VulnSageAgent/PoCs/tree/main/JavaScript/prototype-pollution/CVE-2025-57323 web
https://github.com/regularjs/regular package