SUSE-SU-2026:20995-1: low: Security update for dnsdist

[SLE-UPDATES]

# Security update for dnsdist

Announcement ID: SUSE-SU-2026:20995-1  
Release Date: 2026-04-02T09:11:51Z  
Rating: low  
References:

  * bsc#1250054
  * bsc#1253852

  
Cross-References:

  * CVE-2025-30187
  * CVE-2025-8671

  
CVSS scores:

  * CVE-2025-30187 ( SUSE ):  6.3
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2025-30187 ( SUSE ):  3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2025-30187 ( NVD ):  3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2025-8671 ( 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-2025-8671 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2025-8671 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  
Affected Products:

  * SUSE Linux Enterprise Server - BCI 16.0

  
  
An update that solves two vulnerabilities can now be installed.

## Description:

This update for dnsdist fixes the following issues:

Update to dnsdist 1.9.11:

  * CVE-2025-8671: add mitigations for the HTTP/2 MadeYouReset attack
    (bsc#1253852).
  * CVE-2025-30187: denial of service via crafted DoH exchange (bsc#1250054).

## 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 - BCI 16.0  
    zypper in -t patch SUSE-SLES-16.0-475=1

## Package List:

  * SUSE Linux Enterprise Server - BCI 16.0 (aarch64 s390x x86_64)
    * dnsdist-debugsource-1.9.11-160000.1.1
    * dnsdist-1.9.11-160000.1.1
    * dnsdist-debuginfo-1.9.11-160000.1.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-30187.html
  * https://www.suse.com/security/cve/CVE-2025-8671.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1250054
  * https://bugzilla.suse.com/show_bug.cgi?id=1253852

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