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[Security] FilteredObjectInputStream allowlist bypass via java.rmi.MarshalledObject with auto-trigger during LogEvent deserialization (2.11.0-2.26.1)

waiting-for-maintainer

Status: Open.

#4255 In apache/logging-log4j2;

· U-Sec opened on Aug 24, 2026

Predefined ANSI styles (Style=Spock, Style=Kirk) never apply

Status: Open.

#4254 In apache/logging-log4j2;

· ramanathan1504 opened on Aug 21, 2026

Log4j2EventListener's @ConditionalOnProperty has no effect - the listener always runs

waiting-for-maintainer

Status: Open.

#4244 In apache/logging-log4j2;

· ramanathan1504 opened on Aug 5, 2026

CsvParameterLayout throws NullPointerException on any event without parameters

Status: Open.

#4243 In apache/logging-log4j2;

· ramanathan1504 opened on Aug 5, 2026

log4j-cassandra: failed appender startup leaks the DataStax Cluster, so the JVM never exits

Status: Open.

#4242 In apache/logging-log4j2;

· ramanathan1504 opened on Aug 5, 2026

AbstractDatabaseManager: a manager whose startup failed still receives writes, and is never shut down

Status: Open.

#4241 In apache/logging-log4j2;

· ramanathan1504 opened on Aug 5, 2026

Default protocol to UDP in the Log4j 1 SyslogAppender builder

waiting-for-maintainer

Status: Open.

#4238 In apache/logging-log4j2;

· ppkarwasz opened on Aug 4, 2026

Log4j1SyslogLayout javadoc documents a non-existent escapeNL option

Status: Open.

#4237 In apache/logging-log4j2;

· ppkarwasz opened on Aug 4, 2026

Warning emitted in case of omitted GraalVmProcessor arguments disrupts strict -Xlint-enabled compilation

waiting-for-maintainer

Status: Open.

#4231 In apache/logging-log4j2;

· stechio opened on Jul 30, 2026

Add security considerations to the RoutingAppender documentation

documentationPull requests or issues that affect documentationPull requests or issues that affect documentation

Status: Open.

#4181 In apache/logging-log4j2;

· h4xr opened on Jul 13, 2026

JsonTemplateLayout: add MDC key filtering to ThreadContextMapResolver and harden EcsLayout.json`

enhancementAdditions or updates to featuresAdditions or updates to features

Status: Open.

#4166 In apache/logging-log4j2;

· ppkarwasz opened on Jun 29, 2026

Missing ANSI Italic Style and Rendering Error in Underline Style

bugIncorrect, unexpected, or unintended behavior of existing codeIncorrect, unexpected, or unintended behavior of existing code

layoutsAffects one or more Layout pluginsAffects one or more Layout plugins

Status: Open.

#4105 In apache/logging-log4j2;

· raphaelNguyen opened on Apr 23, 2026

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2.x