assign-deep is vulnerable to Prototype Pollution in versions before 0.4.8 and version 1.0.0. The function assign-deep could be tricked into adding or modifying properties of Object.prototype using either a constructor or a _proto_ payload.

Affected: npm: assign-deep

Versions of `assign-deep` prior to 1.0.1 and 0.4.8 are vulnerable to Prototype Pollution. The `assign` function fails to validate which Object properties it updates. This allows attackers to modify the prototype of Object, causing the addition or modification of an existing property on all objects.

## Recommendation

Upgrade to versions 1.0.1, 0.4.8, or later.