CVE-2020-24978: Nasm Netwide Assembler

Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days.

In NASM 2.15.04rc3, there is a double-free vulnerability in pp_tokline asm/preproc.c. This is fixed in commit 8806c3ca007b84accac21dd88b900fb03614ceb7.

Affected products

• Nasm Netwide Assembler: version 2.15.04 only

Published 2020-09-04. Last modified 2026-06-17.