SUSE-SU-2026:1843-1: moderate: Security update for log4j

[SLE-UPDATES]

# Security update for log4j

Announcement ID: SUSE-SU-2026:1843-1  
Release Date: 2026-05-13T15:24:58Z  
Rating: moderate  
References:

  * bsc#1262050
  * bsc#1262091
  * bsc#1262092
  * bsc#1262093

  
Cross-References:

  * CVE-2026-34477
  * CVE-2026-34479
  * CVE-2026-34480
  * CVE-2026-34481

  
CVSS scores:

  * CVE-2026-34477 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
  * CVE-2026-34477 ( NVD ):  6.3
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-34477 ( NVD ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
  * CVE-2026-34479 ( SUSE ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-34479 ( NVD ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-34479 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
  * CVE-2026-34480 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
  * CVE-2026-34480 ( NVD ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-34480 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
  * CVE-2026-34481 ( SUSE ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-34481 ( NVD ):  6.3
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-34481 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

  
Affected Products:

  * Basesystem Module 15-SP7
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Real Time 15 SP7
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7

  
  
An update that solves four vulnerabilities can now be installed.

## Description:

This update for log4j fixes the following issues:

  * CVE-2026-34477: TLS connections vulnerable to interception due to incomplete
    hostname verification configuration checks (bsc#1262050).
  * CVE-2026-34479: silent log event loss due to improper XML escaping in
    `Log4j1XmlLayout` (bsc#1262091).
  * CVE-2026-34480: silent log event loss due to improper XML escaping in
    `XmlLayout` (bsc#1262092).
  * CVE-2026-34481: silent log event loss due to improper serialization of non-
    finite floating-point values in `JsonTemplateLayout` (bsc#1262093).

## 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:

  * Basesystem Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-1843=1

## Package List:

  * Basesystem Module 15-SP7 (noarch)
    * log4j-jcl-2.20.0-150200.4.33.1
    * log4j-javadoc-2.20.0-150200.4.33.1
    * log4j-slf4j-2.20.0-150200.4.33.1
    * log4j-2.20.0-150200.4.33.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-34477.html
  * https://www.suse.com/security/cve/CVE-2026-34479.html
  * https://www.suse.com/security/cve/CVE-2026-34480.html
  * https://www.suse.com/security/cve/CVE-2026-34481.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1262050
  * https://bugzilla.suse.com/show_bug.cgi?id=1262091
  * https://bugzilla.suse.com/show_bug.cgi?id=1262092
  * https://bugzilla.suse.com/show_bug.cgi?id=1262093

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