SUSE-SU-2026:0254-1

This update for log4j fixes the following issues:

Security fixes:

• CVE-2025-68161: Fixed absent TLS hostname verification that may allow a man-in-the-middle attack (bsc#1255427)

Other fixes:

• Upgrade to 2.18.0
  • Added
    • Add support for Jakarta Mail API in the SMTP appender.
    • Add support for custom Log4j 1.x levels.
    • Add support for adding and retrieving appenders in Log4j 1.x bridge.
    • Add support for custom LMAX disruptor WaitStrategy configuration.
    • Add support for Apache Extras' RollingFileAppender in Log4j 1.x bridge.
    • Add MutableThreadContextMapFilter.
    • Add support for 24 colors in highlighting
  • Changed
    • Improves ServiceLoader support on servlet containers.
    • Make the default disruptor WaitStrategy used by Async Loggers garbage-free.
    • Do not throw UnsupportedOperationException when JUL ApiLogger::setLevel is called.
    • Support Spring 2.6.x.
    • Move perf tests to log4j-core-its
    • Upgrade the Flume Appender to Flume 1.10.0
  • Fixed
    • Fix minor typo #792.
    • Improve validation and reporting of configuration errors.
    • Allow enterprise id to be an OID fragment.
    • Fix problem with non-uppercase custom levels.
    • Avoid ClassCastException in JeroMqManager with custom LoggerContextFactory #791.
    • DirectWriteRolloverStrategy should use the current time when creating files.
    • Fixes the syslog appender in Log4j 1.x bridge, when used with a custom layout.
    • log4j-1.2-api 2.17.2 throws NullPointerException while removing appender with name as null.
    • Improve JsonTemplateLayout performance.
    • Fix resolution of non-Log4j properties.
    • Fixes Spring Boot logging system registration in a multi-application environment.
    • JAR file containing Log4j configuration isn’t closed.
    • Properties defined in configuration using a value attribute (as opposed to element) are read correctly.
    • Syslog appender lacks the SocketOptions setting.
    • Log4j 1.2 bridge should not wrap components unnecessarily.
    • Update 3rd party dependencies for 2.18.0.
    • SizeBasedTriggeringPolicy would fail to rename files properly when integer pattern contained a leading zero.
    • Fixes default SslConfiguration, when a custom keystore is used.
    • Fixes appender concurrency problems in Log4j 1.x bridge.
    • Fix and test for race condition in FileUtils.mkdir().
    • LocalizedMessage logs misleading errors on the console.
    • Add missing message parameterization in RegexFilter.
    • Add the missing context stack to JsonLayout template.
    • HttpWatcher did not pass credentials when polling.
    • UrlConnectionFactory.createConnection now accepts an AuthorizationProvider as a parameter.
    • The DirectWriteRolloverStrategy was not detecting the correct index to use during startup.
    • Async Loggers were including the location information by default.
    • ClassArbiter’s newBuilder method referenced the wrong class.
    • Don’t use Paths.get() to avoid circular file systems.
    • Fix parsing error, when XInclude is disabled.
    • Fix LevelRangeFilterBuilder to align with log4j1’s behavior.
    • Fixes problem with wrong ANSI escape code for bright colors
    • Log4j 1.2 bridge should generate Log4j 2.x messages based on the parameter runtime type.
• Update to 2.19.0
  • Added
    • Add implementation of SLF4J2 fluent API.
    • Add support for SLF4J2 stack-valued MDC.
  • Changed
    • Add getExplicitLevel method to LoggerConfig.
    • Allow PropertySources to be added.
    • Allow Plugins to be injected with the LoggerContext reference.
  • Fixed
    • Add correct manifest entries for OSGi to log4j-jcl
    • Improve support for passwordless keystores.
    • SystemPropertyArbiter was assigning the value as the name.
    • Make JsonTemplateLayout stack trace truncation operate for each label block.
    • Fix recursion between Log4j 1.2 LogManager and Category.
    • Fix resolution of properties not starting with log4j2..
    • Logger$PrivateConfig.filter(Level, Marker, String) was allocating empty varargs array.
    • Allows a space separated list of style specifiers in the %style pattern for consistency with %highlight.
    • Fix NPE in log4j-to-jul in the case the root logger level is null.
    • Fix RollingRandomAccessFileAppender with DirectWriteRolloverStrategy can’t create the first log file of different directory.
    • Generate new SSL certs for testing.
    • Fix ServiceLoaderUtil behavior in the presence of a SecurityManager.
    • Fix regression in Rfc5424Layout default values.
    • Harden InstantFormatter against delegate failures.
    • Add async support to Log4jServletFilter.
  • Removed
    • Removed build page in favor of a single build instructions file.
    • Remove SLF4J 1.8.x binding.
• Update to 2.20.0
  • Added
    • Add support for timezones in RollingFileAppender date pattern
    • Add LogEvent timestamp to ProducerRecord in KafkaAppender
    • Add PatternLayout support for abbreviating the name of all logger components except the 2 rightmost
    • Removes internal field that leaked into public API.
    • Add a LogBuilder#logAndGet() method to emulate the Logger#traceEntry method.
  • Changed
    • Simplify site generation
    • Switch the issue tracker from JIRA to GitHub Issues
    • Remove liquibase-log4j2 maven module
    • Fix order of stacktrace elements, that causes cache misses in ThrowableProxyHelper.
    • Switch from com.sun.mail to Eclipse Angus.
    • Add Log4j2 Core as default runtime dependency of the SLF4J2-to-Log4j2 API bridge.
    • Replace maven-changes-plugin with a custom changelog implementation
    • Moved log4j-api and log4j-core artifacts with classifier tests to log4j-api-test and log4j-core-test respectively.
  • Deprecated
    • Deprecate support for package scanning for plugins
  • Fixed
    • Copy programmatically supplied location even if includeLocation='false'.
    • Eliminate status logger warning, when disableAnsi or noConsoleNoAnsi is used the style and highlight patterns.
    • Fix detection of location requirements in RewriteAppender.
    • Replace regex with manual code to escape characters in Rfc5424Layout.
    • Fix java.sql.Time object formatting in MapMessage
    • Fix previous fire time computation in CronTriggeringPolicy
    • Correct default to not include location for AsyncRootLoggers
    • Make StatusConsoleListener use SimpleLogger internally.
    • Lazily evaluate the level of a SLF4J LogEventBuilder
    • Fixes priority of Legacy system properties, which are now back to having higher priority than Environment variables.
    • Protects ServiceLoaderUtil from unchecked ServiceLoader exceptions.
    • Fix Configurator#setLevel for internal classes
    • Fix level propagation in Log4jBridgeHandler
    • Disable OsgiServiceLocator if not running in OSGI container.
    • When using a Date Lookup in the file pattern the current time should be used.
    • Fixed LogBuilder filtering in the presence of global filters.