DEBIAN-CVE-2026-40211: dnsdist security update

DEBIAN-CVE-2026-40211, released June 26, 2026, fixes 1 CVE in dnsdist. None of them is reported as exploited. Patch Radar priority: Routine.

Routine

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

5.3

Base score, 0 to 10

Highest EPSS

0.0070

53rd percentile

Fixed package versions

Product	Release	Fixed in
dnsdist	Debian 13.5 (trixie)	1.9.15-0+deb13u1
dnsdist	Debian 14	2.1.0-1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Routine	CVE-2026-40211	dnsdist: An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being fr...	5.3	0.0070	None reported

Also fixes CVE-2026-40211

SUSE-SU-2026:23146-1
dnsdist on sles 16.0
OPENSUSE-SU-2026:21533-1
dnsdist on opensuse-leap 16.0

Vendor advisory

https://security-tracker.debian.org/tracker/CVE-2026-40211

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