CVE-2026-6067

Name	CVE-2026-6067
Description	A heap buffer overflow vulnerability exists in the Netwide Assembler (NASM) due to a lack of bounds checking in the obj_directive() function. This vulnerability can be exploited by a user assembling a malicious .asm file, potentially leading to heap memory corruption, denial of service (crash), and arbitrary code execution.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
nasm (PTS)	bullseye	2.15.05-1	vulnerable
	bookworm	2.16.01-1	vulnerable
	trixie	2.16.03-1	vulnerable
	forky, sid	3.01-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
nasm	source	(unstable)	(unfixed)

https://github.com/netwide-assembler/nasm/issues/203