merge-deep node module before 3.0.1 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.
CVSS Vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HMerge Deep Project Merge Deep
APPMerge-Deep Project< 3.0.1
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CHECK WITH VENDOR
No clear patch data available. Check vendor references.