CVE-2026-123588

Name	CVE-2026-123588
Description	The recursive resolver in Hickory DNS (all versions of the hickory-recursor crate, and hickory-resolver 0.26.0 before 0.26.2) caches an empty connection pool when it follows a referral with no glue records and all queries for the name servers' IP addresses fail. An attacker able to spoof DNS responses can make these lookups fail, causing all subsequent queries for the affected zone to fail until the cache entry expires or is evicted.
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-recursor (PTS)	trixie	0.24.1-1	vulnerable
	forky, sid	0.25.2-6	vulnerable
rust-hickory-resolver (PTS)	trixie	0.24.4-1	vulnerable
	forky, sid	0.26.3-1	fixed

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

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

https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-9px7-7m25-f6q2