SUSE-SU-2026:21318-1: moderate: Security update for haproxy

[SLE-UPDATES]

# Security update for haproxy

Announcement ID: SUSE-SU-2026:21318-1  
Release Date: 2026-04-22T10:53:44Z  
Rating: moderate  
References:

  * bsc#1262103

  
Cross-References:

  * CVE-2026-33555

  
CVSS scores:

  * CVE-2026-33555 ( SUSE ):  6.3
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
  * CVE-2026-33555 ( SUSE ):  4.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
  * CVE-2026-33555 ( NVD ):  4.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

  
Affected Products:

  * SUSE Linux Micro 6.0

  
  
An update that solves one vulnerability can now be installed.

## Description:

This update for haproxy fixes the following issue:

  * CVE-2026-33555: improper validation when matching a received body length to
    a previously announced `Content-Length` can lead to request smuggling due to
    HTTP/3 parser desynchronization (bsc#1262103).

## 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 Micro 6.0  
    zypper in -t patch SUSE-SLE-Micro-6.0-683=1

## Package List:

  * SUSE Linux Micro 6.0 (aarch64 s390x x86_64)
    * haproxy-debuginfo-2.8.11+git0.01c1056a4-3.1
    * haproxy-debugsource-2.8.11+git0.01c1056a4-3.1
    * haproxy-2.8.11+git0.01c1056a4-3.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-33555.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1262103

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