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.
{
"github_reviewed_at": "2025-09-25T19:28:53Z",
"github_reviewed": true,
"severity": "HIGH",
"nvd_published_at": "2025-09-24T20:15:32Z",
"cwe_ids": [
"CWE-1321"
]
}