Netwide Assembler (NASM) 2.14rc15 has a heap-based buffer over-read in expand_mmac_params in asm/preproc.c for insufficient input.
https://repo.or.cz/nasm.git/commit/661f723d39e03ca6eb05d7376a43ca33db478354
https://bugzilla.nasm.us/show_bug.cgi?id=3392521
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00015.html