Description
Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, `HttpContentEncoder` (the superclass of the production handler `HttpContentCompressor`) maintains a per-channel `ArrayDeque<CharSequence>` named `acceptEncodingQueue` that accumulates attacker-controlled data without any size limit. The queue is filled on the I/O thread for every inbound HTTP request and drained only when the application later writes a non-1xx response. This creates a resource exhaustion vulnerability when an attacker exploits HTTP/1.1 pipelining to flood the connection with requests faster than the application produces responses. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| netty | netty | >= 4.2.0.Final, < 4.2.16.Final, < 4.1.136.Final | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | netty | No fix yet | — |
| Debian 13 | netty | No fix yet | — |
| Debian 12 | netty | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | netty | No fix yet | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | netty | No fix yet | — |
| Ubuntu Pro 24.04 LTS | netty | No fix yet | — |
| Ubuntu Pro 22.04 LTS | netty | No fix yet | — |
| Ubuntu Pro 20.04 LTS | netty | No fix yet | — |
| Ubuntu Pro 18.04 LTS | netty | No fix yet | — |
| Ubuntu Pro 16.04 LTS | netty | No fix yet | — |
| Ubuntu Pro 14.04 LTS | netty | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss EAP 8 | eap8-activemq-artemis +14 | 2.40.0-8.redhat_00024.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-apache-cxf +3 | 4.1.7-1.SP1_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-artemis-wildfly-integration | 2.0.5-1.Final_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-bouncycastle +5 | 1.85.0-1.redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-cryptacular | 1.2.7-1.redhat_00002.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-eap-product-conf-parent +1 | 801.8.0-1.GA_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-hibernate +2 | 6.6.54-1.Final_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-httpcomponents-asyncclient | 4.1.5-5.redhat_00008.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-ironjacamar +8 | 3.0.22-1.Final_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jackson-core +12 | 2.18.9-1.redhat_00003.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jakarta-xml-bind-api | 4.0.5-1.redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jaxb +9 | 4.0.7-4.redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jaxbintros | 2.1.0-1.redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jboss-logging | 3.6.3-1.Final_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jboss-remoting | 5.0.31-1.SP2_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jbossws-api | 3.1.0-1.Final_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jbossws-common-tools | 2.2.0-1.Final_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jbossws-cxf | 7.4.0-1.Final_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jbossws-jaxws-undertow-httpspi | 3.0.1-1.Final_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jbossws-spi | 5.1.0-1.Final_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-jsf-impl | 4.0.11-2.SP1_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-log4j | 2.25.4-1.redhat_00003.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-neethi | 3.2.2-1.redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-netty +14 | 4.1.136-1.Final_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-nimbus-jose-jwt | 9.37.4-1.redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-parsson | 1.1.9-1.redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-saaj-impl +1 | 3.0.6-1.redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-slf4j +1 | 2.0.18-1.redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-undertow | 2.3.26-2.SP3_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-wildfly +3 | 8.1.8-9.GA_redhat_00006.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-wildfly-elytron +1 | 2.6.11-1.Final_redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-wildfly-javadocs | 8.1.1-12.GA_redhat_00048.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
| Red Hat JBoss EAP 8 | eap8-ws-commons-XmlSchema | 2.3.2-1.redhat_00001.1.el8eap | RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | netty | 4.1.136-150200.4.53.1 | SUSE-SU-2026:3482-1 |
| SLES 15 SP7 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLES 15 SP6 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLES 15 SP5 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLES 15 SP4 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLES for SAP 15 SP5 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLES for SAP 15 SP4 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLE HPC 15 SP5 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLE HPC 15 SP4 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | netty | 4.1.136-1.1 | openSUSE-SU-2026:11394-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | akhq | 0.27.1-r12 | — |
| Wolfi rolling | apache-activemq-artemis | 2.55.0-r1 | — |
| Wolfi rolling | apache-nifi | 2.10.0-r6 | — |
| Wolfi rolling | apache-pulsar-4.2 | 4.2.3-r3 | — |
| Wolfi rolling | apicurio-registry | 3.3.0-r11 | — |
| Wolfi rolling | celeborn-0.6 | 0.6.3-r13 | — |
| Wolfi rolling | cloudwatch-exporter | 0.18.0-r1 | — |
| Wolfi rolling | druid | 37.0.0-r45 | — |
| Wolfi rolling | flyway | 13.0.0-r1 | — |
| Wolfi rolling | infinispan-16.1 | 16.1.4-r7 | — |
| Wolfi rolling | infinispan-16.2 | 16.2.1-r2 | — |
| Wolfi rolling | keycloak-26.6 +2 | 26.6.4-r24 | — |
| Wolfi rolling | kserve-modelmesh | 0.12.0-r38 | — |
| Wolfi rolling | logstash-9.3 +5 | No fix yet | — |
| Wolfi rolling | logstash-9.4 +1 | 9.4.4-r3 | — |
| Wolfi rolling | management-api-for-apache-cassandra-5.0 | 0.1.122-r2 | — |
| Wolfi rolling | neo4j-2026.05 +1 | 2026.05.0-r12 | — |
| Wolfi rolling | neo4j-2026.06 | 2026.06.0-r4 | — |
| Wolfi rolling | opensearch-2 | 2.19.6-r6 | — |
| Wolfi rolling | opensearch-3 +6 | 3.7.0-r5 | — |
| Wolfi rolling | opensearch-3-discovery-ec2 +2 | 3.8.0-r3 | — |
| Wolfi rolling | opensearch-3-security-analytics | 3.8.0-r2 | — |
| Wolfi rolling | sonarqube | 26.9.0.129388-r4 | — |
| Wolfi rolling | spark-4.0-scala-2.13 | 4.0.4-r1 | — |
| Wolfi rolling | spark-4.1-scala-2.13 | 4.1.3-r2 | — |
| Wolfi rolling | strimzi-kafka-operator-kafka-init +6 | 1.1.0-r4 | — |
| Wolfi rolling | tez | 0.10.5-r24 | — |
| Wolfi rolling | thingsboard-tb-node +1 | 4.3.1.3-r9 | — |
| Wolfi rolling | trino-plugin-opensearch | 483-r7 | — |
| Wolfi rolling | wavefront-proxy | 13.9-r24 | — |
| Wolfi rolling | zipkin +1 | 3.6.1-r19 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | io.netty:netty-codec-http | >= 4.2.0.Final, < 4.2.16.Final | 4.2.16.Final | GHSA-q4f6-jm68-57ww |
| Maven | io.netty:netty-codec-http | < 4.1.136.Final | 4.1.136.Final | GHSA-q4f6-jm68-57ww |
Advisories 7
- WID-SEC-2026-2356 Netty: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2026
- RHSA-2026:70230 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.8 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:70229 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.8 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:70228 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.8 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- SCA-2026-0013 Vulnerabilities Affecting SICK CorivaEngine SICK PSIRT · Sep 11, 2026
- SUSE-SU-2026:3482-1 Security update for netty, netty-tcnative SUSE / openSUSE Security Updates · Aug 5, 2026
- openSUSE-SU-2026:11394-1 netty-4.1.136-1.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026