Versions of lodash.defaultsdeep before 4.6.1 are vulnerable to Prototype Pollution. The function 'defaultsDeep' may allow 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.

Recommendation

Update to version 4.6.1 or later.

References

• https://www.npmjs.com/advisories/1070