@tsed/core/.../core@4.20.0 vulnerabilities

@tsed/core is a package of Ts.ED framework.

Affected versions of this package are vulnerable to Prototype Pollution. This vulnerability relates to the deepExtend function which is used as part of the utils directory. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.

PoC

import {deepExtends} from "../../src";

var payload = JSON.parse('{"__proto__": {"a": "vulnerable"}}');
let result = deepExtends( { security: [{"1": "o"}]},payload)

console.log(result);
console.log({}.a);

Upgrade @tsed/core to version 5.65.7 or higher.