CVE-2025-57323: mpregular vulnerable to prototype pollution

September 24, 2025 (updated September 25, 2025)

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

github.com/VulnSageAgent/PoCs/blob/main/JavaScript/prototype-pollution/mpregular%400.2.0/index.js
github.com/VulnSageAgent/PoCs/tree/main/JavaScript/prototype-pollution/CVE-2025-57323
github.com/advisories/GHSA-xx4g-r65p-3qf2
github.com/regularjs/regular
nvd.nist.gov/vuln/detail/CVE-2025-57323

Code Behaviors & Features

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