CVE-2026-12725

Name	CVE-2026-12725
Description	A heap-based buffer overflow was found in dnsmasq. When DNSSEC validation and query logging are both enabled, logging of DS or DNSKEY replies containing unsupported algorithm or digest types can cause dnsmasq to write past the end of an internal logging buffer. A remote attacker able to supply such a DNS response may crash the dnsmasq process, resulting in denial of service.
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=2490763
Fixed by: https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=36d081e37477027fd721fea498f3760f529034ad (v2.93test10)