CVE-2025-58056

About vulnerability

Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. In versions 4.1.124.Final, and 4.2.0.Alpha3 through 4.2.4.Final, Netty incorrectly accepts standalone newline characters (LF) as a chunk-size line terminator, regardless of a preceding carriage return (CR), instead of requiring CRLF per HTTP/1.1 standards. When combined with reverse proxies that parse LF differently (treating it as part of the chunk extension), attackers can craft requests that the proxy sees as one request but Netty processes as two, enabling request smuggling attacks. This is fixed in versions 4.1.125.Final and 4.2.5.Final.

Affected product:

Apache ActiveMQ , Apache Hadoop , Apache Hive , Apache Kafka , Apache Lucene , Apache Spark , Eclipse Jetty , Netty , Spring , accumulo , agepredictor , artemis , async-http-client , avro , aws-sdk-java , azure-sdk-for-java , bolt-connection-java , bookkeeper-common-allocator , cassandra-java-driver , couchbase-jvm-clients , cxf , druid , elasticsearch , flume-ng-sdk , grpc-netty , hbase , http-client , infinispan , java-driver , lettuce , lettuce-core , littleproxy , logging-flume , logging-log4j2 , neo4j-bolt-connection-netty , neo4j-java-driver , neo4j-ogm , netty , pulsar , pulsar-client-all , rabbitmq-stream-java-client , rsocket-java , solr , sonatype-aether , tika , wildfly , zookeeper

Affected packages:

spring-boot-security-test-web-helloworld @ 1.5.22.RELEASE (+7079 more)

Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. In versions 4.1.124.Final, and 4.2.0.Alpha3 through 4.2.4.Final, Netty incorrectly accepts standalone newline characters (LF) as a chunk-size line terminator, regardless of a preceding carriage return (CR), instead of requiring CRLF per HTTP/1.1 standards. When combined with reverse proxies that parse LF differently (treating it as part of the chunk extension), attackers can craft requests that the proxy sees as one request but Netty processes as two, enabling request smuggling attacks. This is fixed in versions 4.1.125.Final and 4.2.5.Final.