OPENSUSE-SU-2026:21533-1: dnsdist security update

OPENSUSE-SU-2026:21533-1, released August 5, 2026, fixes 7 CVEs in dnsdist (version 1.9.15-160000.1.1). 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

0.0074

54th percentile

Priority of the 7 CVEs

Patch now 0
                                Urgent 0
                                High 0
                                Routine 7

Fixed package versions

Product	Release	Fixed in
dnsdist	opensuse-leap 16.0	1.9.15-160000.1.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Routine	CVE-2026-40210	dnsdist: An out-of-bounds read might happen when SetMacAddrAction is used, potentially resulting in uninitialized memory being...	4.8	0.0074	None reported
Routine	CVE-2026-40209	dnsdist: An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of...	5.3	0.0070	None reported
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
Routine	CVE-2026-42005	dnsdist: An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a...	4.3	0.0063	None reported
Routine	CVE-2026-40208	dnsdist: An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA fr...	3.7	0.0040	None reported
Routine	CVE-2026-40011	dnsdist: An attacker sending a large number of crafted DNS queries might be able to trigger a dynamic block being inserted wit...	3.7	0.0023	None reported
Routine	CVE-2026-42004	dnsdist: An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritt...	3.7	0.0023	None reported

Also fixes CVE-2026-40210

SUSE-SU-2026:23146-1
dnsdist on sles 16.0
DEBIAN-CVE-2026-40210
dnsdist on Debian 13.5 (trixie), Debian 14

Vendor advisory

https://osv.dev/vulnerability/openSUSE-SU-2026:21533-1

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