Versions of lodash before 4.17.5 are vulnerable to prototype pollution.
The vulnerable functions are 'defaultsDeep', 'merge', and 'mergeWith' which 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.
Update to version 4.17.5 or later.
4.17.54.17.5Exploitability
AV:NAC:LPR:LUI:NScope
S:UImpact
C:NI:HA:NCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N