ImpLib SDK is intended for authoring custom MS-COFF Import Libraries with advanced features, like cdecl2stdcall thunks, importing by ordinal, removing original thunks and others.
There are many nonstandard situations, like interfacing a CDECL DLL from Visual Basic 6, prototyping a set of DLL functions for PureBasic, mangling the symbolic aliases for an existing object file in Visual C/MASM32/NASM and so on. ImpLib is just a set of tools, which might help you solving this kind of problems. It is not required to know the internal structure of an Import Library file.
There are no reported vulnerabilities