All of them main five userland sanitizers are supported on NetBSD.

ASan (amd64, i386, other ports in various degree)

UBSan (all ports)

MSan (amd64)

TSan (amd64)

LSan (amd64, i386, other ports in various degree)

NetBSD pass 95% of the upstream LLVM tests.

There are sanitizers available in the NetBSD kernel.