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merge-deep@3.0.0 vulnerabilities

Recursively merge values in a javascript object.

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Direct Vulnerabilities

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

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Vulnerability Vulnerable Version
  • H
Prototype Pollution

merge-deep is a recursively merges values in a javascript object.

Affected versions of this package are vulnerable to Prototype Pollution. Merge-deep actively attempts to prevent prototype pollution by blocking object property merges into __proto__, however it still allows for prototype pollution of Object.prototype via a constructor payload.

PoC

var mergeDeep = require("merge-deep");
var payload = '{"constructor": {"prototype": {"isAdmin": true}}}';
mergeDeep({}, JSON.parse(payload));

How to fix Prototype Pollution?

Upgrade merge-deep to version 3.0.3 or higher.

<3.0.3
  • M
Prototype Pollution

merge-deep is a recursively merges values in a javascript object.

Affected versions of this package are vulnerable to Prototype Pollution via merging functions. These functions allows a malicious user to modify the prototype of Object via __proto__, causing the addition or modification of an existing property that will exist on all objects.

How to fix Prototype Pollution?

Upgrade merge-deep to version 3.0.1 or higher.

<3.0.1
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