SUSE-SU-2026:23146-1: important: Security update for dnsdist

SLE-UPDATES null at suse.de
Fri Aug 14 12:38:49 UTC 2026 

# Security update for dnsdist

Announcement ID: SUSE-SU-2026:23146-1  
Release Date: 2026-08-05T09:11:20Z  
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 ):  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-2026-40011 ( 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 ( NVD ):  3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
  * 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-2026-40208 ( 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 ( NVD ):  3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
  * 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-2026-40209 ( 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 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * 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-2026-40210 ( 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 ( NVD ):  4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/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-2026-40211 ( 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 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * 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-2026-42004 ( 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 ( NVD ):  3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
  * 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
  * 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 ( NVD ):  4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

  
Affected Products:

  * SUSE Linux Enterprise Server for SAP applications 16.0

  
  
An update that solves seven vulnerabilities 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 SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Enterprise Server for SAP applications 16.0  
    zypper in -t patch SUSE-SLES-16.0-1432=1

## Package List:

  * SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
    * dnsdist-1.9.15-160000.1.1
    * dnsdist-debugsource-1.9.15-160000.1.1
    * dnsdist-debuginfo-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
  * https://bugzilla.suse.com/show_bug.cgi?id=1269201
  * https://bugzilla.suse.com/show_bug.cgi?id=1269202
  * https://bugzilla.suse.com/show_bug.cgi?id=1269203
  * https://bugzilla.suse.com/show_bug.cgi?id=1269204
  * https://bugzilla.suse.com/show_bug.cgi?id=1269205
  * https://bugzilla.suse.com/show_bug.cgi?id=1269206
  * https://bugzilla.suse.com/show_bug.cgi?id=1269207

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