mpath@0.6.0 vulnerabilities

{G,S}et object values using MongoDB-like path notation

Direct Vulnerabilities

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

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Vulnerability Vulnerable Version
  • M
Prototype Pollution

mpath is a package that gets/sets javascript object values using MongoDB-like path notation.

Affected versions of this package are vulnerable to Prototype Pollution. A type confusion vulnerability can lead to a bypass of CVE-2018-16490. In particular, the condition ignoreProperties.indexOf(parts[i]) !== -1 returns -1 if parts[i] is ['__proto__']. This is because the method that has been called if the input is an array is Array.prototype.indexOf() and not String.prototype.indexOf(). They behave differently depending on the type of the input.


const mpath = require('mpath');
// mpath.set(['__proto__', 'polluted'], 'yes', {});
// console.log(polluted); // ReferenceError: polluted is not defined

mpath.set([['__proto__'], 'polluted'], 'yes', {});
console.log(polluted); // yes

How to fix Prototype Pollution?

Upgrade mpath to version 0.8.4 or higher.