In Netwide Assembler (NASM) 2.14rc0, there is an illegal address access in the function paste_tokens() in preproc.c, aka a NULL pointer dereference. It will lead to a denial of service. Upstream issue: https://bugzilla.nasm.us/show_bug.cgi?id=3392423
Created nasm tracking bugs for this issue: Affects: fedora-all [bug 1493190]