CVE-2026-93009

Name	CVE-2026-93009
Description	A flaw was found in dnsmasq. The DHCPv6 client hostname parser can read one byte past the end of a crafted FQDN option because it checks the next label length before confirming the pointer is still inside the option. An attacker on the local network can trigger this with a single DHCPv6 packet. The extra byte is not returned to the client or logged, and no crash has been demonstrated.
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
dnsmasq (PTS)	bookworm, bookworm (security)	2.90-4~deb12u2	vulnerable
	trixie	2.91-1+deb13u2	vulnerable
	trixie (security)	2.91-1+deb13u1	vulnerable
	forky, sid	2.93-3	vulnerable

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

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

https://bugzilla.redhat.com/show_bug.cgi?id=2536083
check upstream details