In NASM 2.15.04rc3, there is a double-free vulnerability in pp_tokline asm/preproc.c. This is fixed in commit 8806c3ca007b84accac21dd88b900fb03614ceb7. CREATE(Triage):(User=admin) [CVE-2020-24978|https://nvd.nist.gov/vuln/detail/CVE-2020-24978]