CVE-2026-123591

Name	CVE-2026-123591
Description	Hickory DNS hickory-net 0.26.0-beta.1 before 0.26.2 and hickory-proto through 0.26.0-alpha.1 fail to verify, per RFC 6840 §4.4, that an NSEC or NSEC3 record denying a DS RRset also proves the delegation's NS record exists. Attackers can reuse child-side NSEC or NSEC3 records to fake an insecure delegation and forge child-zone records.
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
rust-hickory-net (PTS)	forky, sid	0.26.3-1	fixed
rust-hickory-proto (PTS)	trixie	0.24.4-2	vulnerable
	forky, sid	0.26.3-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
rust-hickory-net	source	(unstable)	0.26.3-1
rust-hickory-proto	source	(unstable)	(unfixed)

https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-7php-9j59-g3ch