In Netwide Assembler (NASM) 2.14rc0, there is an illegal address access in the function find_cc() in asm/preproc.c that will cause a remote denial of service attack, because pointers associated with skip_white_ calls are not validated.
https://usn.ubuntu.com/3694-1/
http://repo.or.cz/nasm.git/commit/7524cfd91492e6e3719b959498be584a9ced13af