CVE-2026-3593

Name	CVE-2026-3593
Description	A use-after-free vulnerability exists within the DNS-over-HTTPS implementation. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.
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
bind9 (PTS)	bookworm	1:9.18.49-1~deb12u1	fixed
	bookworm (security)	1:9.18.49-1~deb12u2	fixed
	trixie (security), trixie	1:9.20.26-1~deb13u1	fixed
	forky, sid	1:9.20.27-2	fixed

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

Package	Type	Release	Fixed Version
bind9	source	bullseye	(not affected)
bind9	source	bookworm	(not affected)
bind9	source	trixie	1:9.20.23-1~deb13u1
bind9	source	(unstable)	1:9.20.23-1

Notes

[bookworm] - bind9 <not-affected> (Only affects Bind 9.20)
[bullseye] - bind9 <not-affected> (Only affects Bind 9.20)
https://kb.isc.org/docs/cve-2026-3593