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: out-of-bounds read when `SetMacAddrAction` is used can lead to uninitialized memory being sent over	4.8	0.0074	None reported
Routine	CVE-2026-40209	dnsdist: outgoing TCP connections to backend can get stuck until a timeout occurs when specially crafted IXFR	5.3	0.0070	None reported
Routine	CVE-2026-40211	dnsdist: crafted DNS over HTTP/3 queries can trigger an exception that prevents memory from being freed and can	5.3	0.0070	None reported
Routine	CVE-2026-42005	dnsdist: crafted web request can cause unlimited memory allocation in the internal web server and lead to a DoS	4.3	0.0063	None reported
Routine	CVE-2026-40208	dnsdist: processing of DoH3 queries can be delayed via DoH3 GET queries with an invalid DATA frames	3.7	0.0040	None reported
Routine	CVE-2026-40011	dnsdist: invalid output produced in the prometheus endpoint when a large number of crafted DNS queries are sent	3.7	0.0023	None reported
Routine	CVE-2026-42004	dnsdist: crafted EDNS OPT record will be ignored by filtering rules, but will be rewritten as a valid OPT	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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