CVE-2026-41292

Name	CVE-2026-41292
Description	NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100).
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)
References	DSA-6304-1
Debian Bugs	1137187

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
unbound (PTS)	bullseye	1.13.1-1+deb11u2	vulnerable
	bullseye (security)	1.13.1-1+deb11u7	vulnerable
	bookworm	1.17.1-2+deb12u4	vulnerable
	bookworm (security)	1.17.1-2+deb12u3	vulnerable
	trixie	1.22.0-2+deb13u2	vulnerable
	trixie (security)	1.22.0-2+deb13u3	fixed
	forky, sid	1.25.1-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
unbound	source	trixie	1.22.0-2+deb13u3		DSA-6304-1
unbound	source	(unstable)	1.25.1-1			1137187

https://www.openwall.com/lists/oss-security/2026/05/20/5
https://nlnetlabs.nl/downloads/unbound/CVE-2026-41292.txt