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5.8 Medium

CVE-2026-42581 Netty is an asynchronous, event-driven network application framework

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjectDecoder strips a conflicting Content-Length header when a request carries both Transfer-Encoding: chunked and Content-Length, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving Content-Length intact in the forwarded HttpMessage. Any downstream proxy or handler that trusts Content-Length over Transfer-Encoding will disagree on message boundaries, enabling request smuggling. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Affected products and versions

Product Affected versions Fixed in
netty 4.2 4.2.0.Alpha1 → < 4.2.13.Final 4.2.13.Final
netty 4.1 earliest → < 4.1.133.Final 4.1.133.Final
Cryostat 4 on RHEL 9 4.2 earliest → < 4.2.0-10 4.2.0-10
Red Hat OpenShift Dev Spaces 3.28 1780694994 earliest → < 1780694994 1780694994
Red Hat build of Quarkus 3.27.4 Versions not published
Red Hat build of Quarkus 3.33.2 Versions not published
streams for Apache Kafka 2 Versions not published
OpenShift Serverless Versions not published
Red Hat AMQ Broker 7 Versions not published
Show the 34 other branches
Product Affected versions Fixed in
Red Hat AMQ Clients Versions not published
Red Hat build of Apache Camel 4 for Quarkus 3 Versions not published
Red Hat build of Apache Camel for Spring Boot 4 Versions not published
Red Hat build of Apicurio Registry 2 Versions not published
Red Hat build of Apicurio Registry 3 Versions not published
Red Hat build of Debezium 3 Versions not published
Red Hat Build of Keycloak Versions not published
Red Hat build of OptaPlanner 8 Versions not published
Red Hat Data Grid 8 Versions not published
Red Hat Enterprise Linux AI (RHEL AI) 3 Versions not published
Red Hat Fuse 7 Versions not published
Red Hat JBoss Enterprise Application Platform 7 Versions not published
Red Hat JBoss Enterprise Application Platform 8 Versions not published
Red Hat JBoss Enterprise Application Platform Expansion Pack Versions not published
Red Hat OpenShift AI (RHOAI) Versions not published
Red Hat OpenShift Dev Spaces Versions not published
Red Hat Process Automation 7 Versions not published
Red Hat Satellite 6 Versions not published
Red Hat Single Sign-On 7 Versions not published
streams for Apache Kafka 3 Versions not published
Red Hat OpenShift Dev Spaces 3.29 1782989027 earliest → < 1782989027 1782989027
Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 Versions not published
Red Hat OpenShift AI 2.25 1788198681 earliest → < 1788198681 1788198681
Red Hat JBoss Enterprise Application Platform 7.4.25 Versions not published
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 Versions not published
Streams for Apache Kafka 3.2.1 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Versions not published
Red Hat AMQ Broker 7.13.6 Versions not published
Red Hat AMQ Broker 7.14.1 Versions not published
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 Versions not published
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1.7.GA 4.1 earliest → < 4.1.135.Final-redhat-00001 4.1.135.Final-redhat-00001

References

Timeline

  1. Published
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Other CVEs of netty

The 95 CVEs of netty →
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