<div class="container">
<h1>Recommended update for log4j</h1>
<table class="table table-striped table-bordered">
<tbody>
<tr>
<th>Announcement ID:</th>
<td>SUSE-RU-2026:3145-1</td>
</tr>
<tr>
<th>Release Date:</th>
<td>2026-07-21T08:39:04Z</td>
</tr>
<tr>
<th>Rating:</th>
<td>important</td>
</tr>
<tr>
<th>References:</th>
<td>
<ul>
</ul>
</td>
</tr>
<tr>
<th>Affected Products:</th>
<td>
<ul class="list-group">
<li class="list-group-item">Basesystem Module 15-SP7</li>
<li class="list-group-item">SUSE Linux Enterprise Desktop 15 SP7</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing 15 SP4</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing 15 SP5</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing LTSS 15 SP4</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing LTSS 15 SP5</li>
<li class="list-group-item">SUSE Linux Enterprise Real Time 15 SP7</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP4</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP4 LTSS</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP5</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP5 LTSS</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP6</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP6 LTSS</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP7</li>
<li class="list-group-item">SUSE Linux Enterprise Server for SAP Applications 15 SP4</li>
<li class="list-group-item">SUSE Linux Enterprise Server for SAP Applications 15 SP5</li>
<li class="list-group-item">SUSE Linux Enterprise Server for SAP Applications 15 SP6</li>
<li class="list-group-item">SUSE Linux Enterprise Server for SAP Applications 15 SP7</li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>An update that can now be installed.</p>
<h2>Description:</h2>
<p>This update for log4j fixes the following issues:</p>
<p>log4j was updated and includes fixes and improvements from versions 2.21.0 through 2.26.0:</p>
<ul>
<li>Bugs fixed:</li>
<li>Fixed crashes when logging errors with stack traces modified by other threads</li>
<li>Fixed FATAL-level log messages being silently discarded</li>
<li>Fixed memory leaks in several components</li>
<li>Fixed log file headers not being written correctly when files are recreated</li>
<li>Fixed log file rotation failures</li>
<li>Fixed configuration file loading from HTTP sources</li>
<li>Fixed date and time formatting issues in logs</li>
<li>Fixed problems when multiple threads modify logger settings simultaneously</li>
<li>
<p>Fixed MongoDB appender connection issues</p>
</li>
<li>
<p>New Features Added:</p>
</li>
<li>Support for ZStandard compression for log files</li>
<li>Support for LMAX Disruptor 4.x (high-performance logging)</li>
<li>Better support for GraalVM environments</li>
<li>
<p>Java 8 users now get sub-millisecond precision timestamps</p>
</li>
<li>
<p>Features Removed:</p>
</li>
<li>JMX GUI tool (moved to separate release)</li>
<li>Flume Appender (moved to separate release)</li>
<li>Kubernetes lookup feature (users should migrate to io.fabric8:kubernetes-log4j)</li>
<li>
<p>JAnsi library support (Windows 10+ has built-in color support)</p>
</li>
<li>
<p>Important Changes:</p>
</li>
<li>JMX monitoring is now DISABLED by default (set log4j2.disableJmx=false to enable)</li>
<li>Default log format has changed</li>
<li>
<p>Configuration scripts now require explicit names</p>
</li>
<li>
<p>Deprecations (features to be removed in the future):</p>
</li>
<li>MongoDB4 module (use standard MongoDB module instead)</li>
<li>EventLogger class</li>
<li>Some builder methods (replaced with setter methods)</li>
</ul>
<p>New Runtime Dependencies:</p>
<ul>
<li>jackson-dataformat-xml</li>
<li>stax2-api</li>
<li>woodstox-core</li>
</ul>
<p>New and Updated Build Dependencies:</p>
<ul>
<li>aalto-xml (updated from version 1.3.3 to 1.4.0)</li>
<li>jakarta-annotations (new)</li>
<li>jakarta-messaging (new)</li>
<li>jspecify (new)</li>
</ul>
<h2>Patch Instructions:</h2>
<p>
To install this SUSE update use the SUSE recommended
installation methods like YaST online_update or "zypper patch".<br/>
Alternatively you can run the command listed for your product:
</p>
<ul class="list-group">
<li class="list-group-item">
SUSE Linux Enterprise Server 15 SP5 LTSS
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES-15-SP5-LTSS-2026-3145=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise High Performance Computing LTSS 15 SP4
<br/>
<code>zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-LTSS-2026-3145=1</code>
</li>
<li class="list-group-item">
Basesystem Module 15-SP7
<br/>
<code>zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-3145=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server for SAP Applications 15 SP5
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP5-2026-3145=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server for SAP Applications 15 SP6
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP6-2026-3145=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise High Performance Computing LTSS 15 SP5
<br/>
<code>zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-LTSS-2026-3145=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5
<br/>
<code>zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-ESPOS-2026-3145=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server 15 SP6 LTSS
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-3145=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server 15 SP4 LTSS
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES-15-SP4-LTSS-2026-3145=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server for SAP Applications 15 SP4
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP4-2026-3145=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4
<br/>
<code>zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-ESPOS-2026-3145=1</code>
</li>
</ul>
<h2>Package List:</h2>
<ul>
<li>
SUSE Linux Enterprise Server 15 SP6 LTSS (noarch)
<ul>
<li>log4j-2.26.0-150200.4.36.1</li>
<li>log4j-slf4j-2.26.0-150200.4.36.1</li>
<li>stax2-api-4.3.0-150200.3.8.1</li>
<li>log4j-javadoc-2.26.0-150200.4.36.1</li>
<li>woodstox-core-7.2.1-150200.3.10.1</li>
<li>jackson-dataformat-xml-2.18.8-150200.5.5.1</li>
<li>log4j-jcl-2.26.0-150200.4.36.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server 15 SP5 LTSS (noarch)
<ul>
<li>log4j-2.26.0-150200.4.36.1</li>
<li>log4j-slf4j-2.26.0-150200.4.36.1</li>
<li>stax2-api-4.3.0-150200.3.8.1</li>
<li>log4j-javadoc-2.26.0-150200.4.36.1</li>
<li>woodstox-core-7.2.1-150200.3.10.1</li>
<li>jackson-dataformat-xml-2.18.8-150200.5.5.1</li>
<li>log4j-jcl-2.26.0-150200.4.36.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server for SAP Applications 15 SP5 (noarch)
<ul>
<li>log4j-slf4j-2.26.0-150200.4.36.1</li>
<li>log4j-2.26.0-150200.4.36.1</li>
<li>stax2-api-4.3.0-150200.3.8.1</li>
<li>log4j-javadoc-2.26.0-150200.4.36.1</li>
<li>woodstox-core-7.2.1-150200.3.10.1</li>
<li>jackson-dataformat-xml-2.18.8-150200.5.5.1</li>
<li>log4j-jcl-2.26.0-150200.4.36.1</li>
</ul>
</li>
<li>
Basesystem Module 15-SP7 (noarch)
<ul>
<li>log4j-2.26.0-150200.4.36.1</li>
<li>log4j-slf4j-2.26.0-150200.4.36.1</li>
<li>stax2-api-4.3.0-150200.3.8.1</li>
<li>log4j-javadoc-2.26.0-150200.4.36.1</li>
<li>woodstox-core-7.2.1-150200.3.10.1</li>
<li>jackson-dataformat-xml-2.18.8-150200.5.5.1</li>
<li>log4j-jcl-2.26.0-150200.4.36.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server for SAP Applications 15 SP6 (noarch)
<ul>
<li>log4j-slf4j-2.26.0-150200.4.36.1</li>
<li>log4j-2.26.0-150200.4.36.1</li>
<li>stax2-api-4.3.0-150200.3.8.1</li>
<li>log4j-javadoc-2.26.0-150200.4.36.1</li>
<li>woodstox-core-7.2.1-150200.3.10.1</li>
<li>jackson-dataformat-xml-2.18.8-150200.5.5.1</li>
<li>log4j-jcl-2.26.0-150200.4.36.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server 15 SP4 LTSS (noarch)
<ul>
<li>log4j-slf4j-2.26.0-150200.4.36.1</li>
<li>log4j-2.26.0-150200.4.36.1</li>
<li>stax2-api-4.3.0-150200.3.8.1</li>
<li>log4j-javadoc-2.26.0-150200.4.36.1</li>
<li>woodstox-core-7.2.1-150200.3.10.1</li>
<li>jackson-dataformat-xml-2.18.8-150200.5.5.1</li>
<li>log4j-jcl-2.26.0-150200.4.36.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server for SAP Applications 15 SP4 (noarch)
<ul>
<li>log4j-2.26.0-150200.4.36.1</li>
<li>log4j-slf4j-2.26.0-150200.4.36.1</li>
<li>stax2-api-4.3.0-150200.3.8.1</li>
<li>log4j-javadoc-2.26.0-150200.4.36.1</li>
<li>woodstox-core-7.2.1-150200.3.10.1</li>
<li>jackson-dataformat-xml-2.18.8-150200.5.5.1</li>
<li>log4j-jcl-2.26.0-150200.4.36.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5 (noarch)
<ul>
<li>log4j-slf4j-2.26.0-150200.4.36.1</li>
<li>log4j-2.26.0-150200.4.36.1</li>
<li>stax2-api-4.3.0-150200.3.8.1</li>
<li>log4j-javadoc-2.26.0-150200.4.36.1</li>
<li>woodstox-core-7.2.1-150200.3.10.1</li>
<li>jackson-dataformat-xml-2.18.8-150200.5.5.1</li>
<li>log4j-jcl-2.26.0-150200.4.36.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise High Performance Computing LTSS 15 SP4 (noarch)
<ul>
<li>log4j-slf4j-2.26.0-150200.4.36.1</li>
<li>log4j-2.26.0-150200.4.36.1</li>
<li>stax2-api-4.3.0-150200.3.8.1</li>
<li>log4j-javadoc-2.26.0-150200.4.36.1</li>
<li>woodstox-core-7.2.1-150200.3.10.1</li>
<li>jackson-dataformat-xml-2.18.8-150200.5.5.1</li>
<li>log4j-jcl-2.26.0-150200.4.36.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4 (noarch)
<ul>
<li>log4j-2.26.0-150200.4.36.1</li>
<li>log4j-slf4j-2.26.0-150200.4.36.1</li>
<li>stax2-api-4.3.0-150200.3.8.1</li>
<li>log4j-javadoc-2.26.0-150200.4.36.1</li>
<li>woodstox-core-7.2.1-150200.3.10.1</li>
<li>jackson-dataformat-xml-2.18.8-150200.5.5.1</li>
<li>log4j-jcl-2.26.0-150200.4.36.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise High Performance Computing LTSS 15 SP5 (noarch)
<ul>
<li>log4j-2.26.0-150200.4.36.1</li>
<li>log4j-slf4j-2.26.0-150200.4.36.1</li>
<li>stax2-api-4.3.0-150200.3.8.1</li>
<li>log4j-javadoc-2.26.0-150200.4.36.1</li>
<li>woodstox-core-7.2.1-150200.3.10.1</li>
<li>jackson-dataformat-xml-2.18.8-150200.5.5.1</li>
<li>log4j-jcl-2.26.0-150200.4.36.1</li>
</ul>
</li>
</ul>
</div>