SUSE alert openSUSE-SU-2026:21533-1 (dnsdist)

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openSUSE-SU-2026:21533-1: important: Security update for dnsdist
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Thu, 06 Aug 2026 17:51:34 +0200
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<20260806155134.9668CFDC9@maintenance.suse.de>
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Article
openSUSE security update: security update for dnsdist
-------------------------------------------------------------

Announcement ID: openSUSE-SU-2026:21533-1
Rating: important
References:

  * bsc#1269201
  * bsc#1269202
  * bsc#1269203
  * bsc#1269204
  * bsc#1269205
  * bsc#1269206
  * bsc#1269207



Cross-References:

  * CVE-2026-40011
  * CVE-2026-40208
  * CVE-2026-40209
  * CVE-2026-40210
  * CVE-2026-40211
  * CVE-2026-42004
  * CVE-2026-42005



CVSS scores:

  * CVE-2026-40011 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
  * CVE-2026-40011 ( SUSE ): 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-40208 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-40208 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-40209 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-40209 ( SUSE ): 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-40210 ( SUSE ): 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
  * CVE-2026-40210 ( SUSE ): 8.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-40211 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-40211 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-42004 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
  * CVE-2026-42004 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-42005 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-42005 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Affected Products:

         openSUSE Leap 16.0

-------------------------------------------------------------

An update that solves 7 vulnerabilities and has 7 bug fixes can now be installed.

Description:

This update for dnsdist fixes the following issues:

Update to 1.9.15.

Changes for dnsdist:

- https://www.dnsdist.org/changelog.html#change-1.9.15
- https://www.dnsdist.org/changelog.html#change-1.9.14

Security issues fixed:

- CVE-2026-40011: invalid output produced in the prometheus endpoint when a large number of crafted
DNS queries are sent
  (bsc#1269204).
- CVE-2026-40208: processing of DoH3 queries can be delayed via DoH3 GET queries with an invalid
DATA frames
  (bsc#1269207).
- CVE-2026-40209: outgoing TCP connections to backend can get stuck until a timeout occurs when
specially crafted IXFR
  queries are sent (bsc#1269206).
- CVE-2026-40210: out-of-bounds read when `SetMacAddrAction` is used can lead to uninitialized
memory being sent over
  the network or a crash (bsc#1269205).
- CVE-2026-40211: crafted DNS over HTTP/3 queries can trigger an exception that prevents memory
from being freed and can
  lead to an OOM condition (bsc#1269203).
- CVE-2026-42004: crafted EDNS OPT record will be ignored by filtering rules, but will be rewritten
as a valid OPT
  record when EDNS Client Subnet is inserted (bsc#1269202).
- CVE-2026-42005: crafted web request can cause unlimited memory allocation in the internal web
server and lead to a DoS
  (bsc#1269201).


Patch instructions:

   To install this openSUSE security update use the suse recommended installation methods
   like YaST online_update or "zypper patch".
   Alternatively you can run the command listed for your product:

- openSUSE Leap 16.0

   zypper in -t patch openSUSE-Leap-16.0-1432=1

Package List:

- openSUSE Leap 16.0:

  dnsdist-1.9.15-160000.1.1

References:

  * https://www.suse.com/security/cve/CVE-2026-40011.html
  * https://www.suse.com/security/cve/CVE-2026-40208.html
  * https://www.suse.com/security/cve/CVE-2026-40209.html
  * https://www.suse.com/security/cve/CVE-2026-40210.html
  * https://www.suse.com/security/cve/CVE-2026-40211.html
  * https://www.suse.com/security/cve/CVE-2026-42004.html
  * https://www.suse.com/security/cve/CVE-2026-42005.html