CVE-2026-12969

Name	CVE-2026-12969
Description	An out-of-bounds read vulnerability exists in dnsmasq's find_soa() function in src/rfc1035.c. When parsing NS section records, extract_name() is called with extrabytes=0, failing to validate that 10 additional bytes exist for fixed-length DNS record fields. A remote attacker controlling a DNS zone can exploit this via a crafted NXDOMAIN response to cause a 10-byte heap out-of-bounds read, potentially accessing stale data from prior transactions.
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)	bullseye	2.85-1	vulnerable
	bullseye (security)	2.85-1+deb11u2	vulnerable
	bookworm, bookworm (security)	2.90-4~deb12u2	vulnerable
	trixie (security), trixie	2.91-1+deb13u1	vulnerable
	forky, sid	2.93-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
dnsmasq	source	(unstable)	2.93-1

Notes

[trixie] - dnsmasq <no-dsa> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2491663
Fixed by: https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=14094e88beca519c53151184cc4553656672b54f (v2.93rc1)