CVE-2023-26249

Name	CVE-2023-26249
Description	Knot Resolver before 5.6.0 enables attackers to consume its resources, launching amplification attacks and potentially causing a denial of service. Specifically, a single client query may lead to a hundred TCP connection attempts if a DNS server closes connections without providing a response.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, 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
knot-resolver (PTS)	buster	3.2.1-3	vulnerable
	buster (security)	3.2.1-3+deb10u1	vulnerable
	bullseye	5.3.1-1+deb11u1	vulnerable
	bookworm	5.6.0-1	fixed
	bookworm (security)	5.6.0-1+deb12u1	fixed
	trixie	5.7.1-1	fixed
	sid	5.7.2-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
knot-resolver	source	(unstable)	5.6.0-1

Notes

[bullseye] - knot-resolver <no-dsa> (Minor issue)
[buster] - knot-resolver <no-dsa> (Minor issue)
https://www.knot-resolver.cz/2023-01-26-knot-resolver-5.6.0.html