Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicitly disabled. The newInitialMessage() method creates headers using DefaultHttpHeadersFactory.headersFactory().withValidation(false), then adds user-provided outboundHeaders without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| netty | netty | >= 4.2.0.Alpha1, < 4.2.13.Final, < 4.1.133.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 | — |
| Ubuntu 25.10 | netty | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | netty | 1:4.1.48-16ubuntu0.1~esm2 | — |
| Ubuntu Pro 24.04 LTS | netty | 1:4.1.48-9ubuntu0.1+esm3 | — |
| Ubuntu Pro 22.04 LTS | netty | 1:4.1.48-4+deb11u2ubuntu0.1+esm3 | — |
| Ubuntu Pro 20.04 LTS | netty | 1:4.1.45-1ubuntu0.1~esm6 | — |
| Ubuntu Pro 18.04 LTS | netty | 1:4.1.7-4ubuntu0.1+esm6 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Single Sign On 7 | rh-sso7-keycloak +1 | 18.0.20-1.redhat_00001.1.el7sso | RHSA-2026:76130, RHSA-2026:76129, RHSA-2026:76128 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-hibernate +5 | 5.1.17-5.Final_redhat_00006.1.ep7.el7 | RHSA-2026:73976, RHSA-2026:73644 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-jboss-server-migration +21 | 1.7.2-24.Final_redhat_00026.1.el7eap | RHSA-2026:73644 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-netty +1 | 4.1.63-4.Final_redhat_00005.1.ep7.el7 | RHSA-2026:73976, RHSA-2026:73644 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-wildfly +1 | 7.1.16-1.GA_redhat_00002.1.ep7.el7 | RHSA-2026:73976, RHSA-2026:73644 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-wildfly-javadocs +2 | 7.3.19-1.GA_redhat_00004.1.el7eap | RHSA-2026:73644 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-activemq-artemis +15 | 2.16.0-22.redhat_00057.1.el7eap | RHSA-2026:53644 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-glassfish-jsf | 2.3.14-11.SP11_redhat_00001.1.el7eap | RHSA-2026:53644 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-ironjacamar +8 | 1.5.26-2.Final_redhat_00001.1.el7eap | RHSA-2026:53644 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-jackson-core +10 | 2.18.8-1.redhat_00003.1.el7eap | RHSA-2026:53644 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-jboss-remoting | 5.0.31-3.SP2_redhat_00001.1.el7eap | RHSA-2026:53644 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-jboss-server-migration +2 | 1.10.0-46.Final_redhat_00044.1.el7eap | RHSA-2026:53644 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-netty +26 | 4.1.135-1.Final_redhat_00001.1.el7eap | RHSA-2026:53644 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-picketlink-api +7 | 2.5.5-24.SP12_redhat_00016.1.el7eap | RHSA-2026:53644 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-picketlink-bindings +1 | 2.5.5-30.SP12_redhat_00020.1.el7eap | RHSA-2026:53644 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-undertow | 2.2.40-2.SP3_redhat_00001.1.el7eap | RHSA-2026:53644 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-wildfly +4 | 7.4.25-2.GA_redhat_00001.1.el7eap | RHSA-2026:53644 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss EAP 8 | eap8-eap-product-conf-parent +1 | 801.7.1-1.GA_redhat_00001.1.el8eap | RHSA-2026:49700 |
| Red Hat JBoss EAP 8 | eap8-jose4j | 0.9.6-2.redhat_00002.1.el8eap | RHSA-2026:49700 |
| Red Hat JBoss EAP 8 | eap8-netty +14 | 4.1.135-1.Final_redhat_00001.1.el8eap | RHSA-2026:49700 |
| Red Hat JBoss EAP 8 | eap8-wildfly +3 | 8.1.7.1-1.GA_redhat_00004.1.el8eap | RHSA-2026:49700 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | netty | 4.1.133-150200.4.46.1 | SUSE-SU-2026:2308-1 |
| SLES 15 SP7 | netty-tcnative | 2.0.77-150200.3.39.1 | SUSE-SU-2026:2308-1 |
| SLES 15 SP6 | netty-tcnative | 2.0.77-150200.3.39.1 | SUSE-SU-2026:2308-1 |
| SLES 15 SP5 | netty-tcnative | 2.0.77-150200.3.39.1 | SUSE-SU-2026:2308-1 |
| SLES 15 SP4 | netty-tcnative | 2.0.77-150200.3.39.1 | SUSE-SU-2026:2308-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | netty-tcnative | 2.0.77-150200.3.39.1 | SUSE-SU-2026:2308-1 |
| SLES for SAP 15 SP5 | netty-tcnative | 2.0.77-150200.3.39.1 | SUSE-SU-2026:2308-1 |
| SLES for SAP 15 SP4 | netty-tcnative | 2.0.77-150200.3.39.1 | SUSE-SU-2026:2308-1 |
| SLE HPC 15 SP5 | netty-tcnative | 2.0.77-150200.3.39.1 | SUSE-SU-2026:2308-1 |
| SLE HPC 15 SP4 | netty-tcnative | 2.0.77-150200.3.39.1 | SUSE-SU-2026:2308-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | netty | 4.1.133-1.1 | openSUSE-SU-2026:10795-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | akhq | 0.27.1-r1 | — |
| Wolfi rolling | apache-activemq-artemis | 2.54.0-r1 | — |
| Wolfi rolling | apache-nifi | 2.9.0-r6 | — |
| Wolfi rolling | apache-pulsar-4.2 | 4.2.1-r2 | — |
| Wolfi rolling | apicurio-registry | 3.2.4-r2 | — |
| Wolfi rolling | cassandra-5.0 | 5.0.8-r1 | — |
| Wolfi rolling | celeborn-0.6 | 0.6.3-r3 | — |
| Wolfi rolling | docker-selenium-base | 4.43.0.20260404-r3 | — |
| Wolfi rolling | druid | 37.0.0-r9 | — |
| Wolfi rolling | flyway | 12.6.0-r0 | — |
| Wolfi rolling | keycloak-26.5 +4 | No fix yet | — |
| Wolfi rolling | keycloak-26.6 +2 | 26.6.1-r2 | — |
| Wolfi rolling | kserve-modelmesh | 0.12.0-r33 | — |
| Wolfi rolling | management-api-for-apache-cassandra-5.0 | 0.1.117-r1 | — |
| Wolfi rolling | neo4j-2026.01 | 2026.01.4-r1 | — |
| Wolfi rolling | opensearch-3-repository-azure +1 | 3.6.0-r5 | — |
| Wolfi rolling | spark-4.0-scala-2.13 | 4.0.2-r12 | — |
| Wolfi rolling | spark-4.1-scala-2.13 | 4.1.2-r0 | — |
| Wolfi rolling | strimzi-kafka-operator-kafka-init +5 | 0.51.0-r26 | — |
| Wolfi rolling | strimzi-kafka-operator-kafka-thirdparty-libs-cc | 1.0.0-r2 | — |
| Wolfi rolling | tez | 0.10.5-r12 | — |
| Wolfi rolling | thingsboard-tb-node +1 | 4.3.1.1-r9 | — |
| Wolfi rolling | trino-plugin-hive +9 | 481-r0 | — |
| Wolfi rolling | wavefront-proxy | 13.9-r13 | — |
| Wolfi rolling | wildfly-openjdk-17 +1 | 39.0.1-r11 | — |
| Wolfi rolling | zipkin +1 | 3.6.1-r6 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | io.netty:netty-handler-proxy | < 4.1.133.Final | 4.1.133.Final | GHSA-45q3-82m4-75jr |
| Maven | io.netty:netty-handler-proxy | >= 4.2.0.Alpha1, < 4.2.13.Final | 4.2.13.Final | GHSA-45q3-82m4-75jr |
Advisories 10
- RHSA-2026:76130 Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 security update on RHEL 9 Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:76129 Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 security update on RHEL 8 Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:76128 Red Hat Security Advisory: Red Hat Single Sign-On 7.6.13 security update on RHEL 7 Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:73976 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.1.16 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:73644 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.3.19 Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:53644 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.25 security pdate Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:49700 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.7 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- WID-SEC-2026-1372 Netty: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 15, 2026
- SUSE-SU-2026:2308-1 Security update for netty, netty-tcnative SUSE / openSUSE Security Updates · Jun 10, 2026
- openSUSE-SU-2026:10795-1 netty-4.1.133-1.1 on GA media SUSE / openSUSE Security Updates · May 17, 2026