CVE-2026-12490

Name	CVE-2026-12490
Description	When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match.
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
nsd (PTS)	bullseye	4.3.5-1	fixed
	bookworm	4.6.1-1	vulnerable
	trixie	4.12.0-1	vulnerable
	forky, sid	4.15.0-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
nsd	source	bullseye	(not affected)
nsd	source	(unstable)	4.14.3-1

Notes

[trixie] - nsd <no-dsa> (Minor issue)
[bookworm] - nsd <postponed> (Minor issue)
[bullseye] - nsd <not-affected> (Vulnerable code introduced later)
https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12490.txt