assign-deep node module before 0.4.7 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which 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.

Affected: npm: assign-deep

Versions of `assign-deep` before 0.4.7 are vulnerable to prototype pollution via merging functions.

## Recommendation

Update to version 0.4.7 or later.