All versions of package @ianwalter/merge are vulnerable to Prototype Pollution via the main (merge) function. Maintainer suggests using @generates/merger instead.

merge is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

All versions of package merge are vulnerable to Prototype Pollution via _recursiveMerge .

The merge.recursive function in the merge package <1.2.1 can be tricked into adding or modifying properties of the Object prototype. These properties will be present on all objects allowing for a denial of service attack.