Description
Netty is a network application framework for development of protocol servers and clients. In netty-codec-haproxy prior to versions 4.1.135.Final and 4.2.15.Final, when decoding a PP2_TYPE_SSL TLV, HAProxyMessage.readNextTLV() first calls `header.retainedSlice(header.readerIndex(), length)` and only then reads the 1-byte client field and 4-byte verify field. If the attacker sets the TLV length below 5, the subsequent readByte/readInt throws IndexOutOfBoundsException. HAProxyMessageDecoder only catches HAProxyProtocolException around this call, so the IOOBE propagates and the retained slice on the pooled cumulation buffer is never released. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| netty | netty | >= 4.2.0.Final, < 4.2.15.Final, < 4.1.135.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 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 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 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 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | netty | 4.1.135-150200.4.50.1 | SUSE-SU-2026:2802-1 |
| SLES 15 SP7 | netty-tcnative | 2.0.79-150200.3.45.1 | SUSE-SU-2026:2802-1 |
| SLES 15 SP6 | netty-tcnative | 2.0.79-150200.3.45.1 | SUSE-SU-2026:2802-1 |
| SLES 15 SP5 | netty-tcnative | 2.0.79-150200.3.45.1 | SUSE-SU-2026:2802-1 |
| SLES 15 SP4 | netty-tcnative | 2.0.79-150200.3.45.1 | SUSE-SU-2026:2802-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | netty-tcnative | 2.0.79-150200.3.45.1 | SUSE-SU-2026:2802-1 |
| SLES for SAP 15 SP5 | netty-tcnative | 2.0.79-150200.3.45.1 | SUSE-SU-2026:2802-1 |
| SLES for SAP 15 SP4 | netty-tcnative | 2.0.79-150200.3.45.1 | SUSE-SU-2026:2802-1 |
| SLE HPC 15 SP5 | netty-tcnative | 2.0.79-150200.3.45.1 | SUSE-SU-2026:2802-1 |
| SLE HPC 15 SP4 | netty-tcnative | 2.0.79-150200.3.45.1 | SUSE-SU-2026:2802-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | netty | 4.1.135-1.1 | openSUSE-SU-2026:11033-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | apache-activemq-artemis | 2.54.0-r5 | — |
| Wolfi rolling | apache-pulsar-4.2 | 4.2.2-r3 | — |
| Wolfi rolling | apicurio-registry | 3.3.0-r4 | — |
| Wolfi rolling | celeborn-0.6 | 0.6.3-r8 | — |
| Wolfi rolling | keycloak-26.5 +3 | No fix yet | — |
| Wolfi rolling | keycloak-26.6 +2 | 26.6.3-r3 | — |
| Wolfi rolling | management-api-for-apache-cassandra-5.0 | 0.1.120-r0 | — |
| Wolfi rolling | neo4j-2026.05 | 2026.05.0-r1 | — |
| Wolfi rolling | tez | 0.10.5-r16 | — |
| Wolfi rolling | thingsboard-tb-node +1 | 4.3.1.2-r7 | — |
| Wolfi rolling | trino +4 | 483-r7 | — |
| Wolfi rolling | trino-plugin-hive +7 | 481-r7 | — |
| Wolfi rolling | zipkin | 3.6.1-r10 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | io.netty:netty-codec-haproxy | >= 4.2.0.Final, < 4.2.15.Final | 4.2.15.Final | GHSA-cc37-9q2j-3hfv |
| Maven | io.netty:netty-codec-haproxy | < 4.1.135.Final | 4.1.135.Final | GHSA-cc37-9q2j-3hfv |
Advisories 7
- WID-SEC-2026-1814 Netty: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- 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-2026:53644 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.25 security pdate Red Hat Security Advisories (RHSA) · Oct 20, 2026
- SUSE-SU-2026:2802-1 Security update for netty, netty-tcnative SUSE / openSUSE Security Updates · Jul 9, 2026
- openSUSE-SU-2026:11033-1 netty-4.1.135-1.1 on GA media SUSE / openSUSE Security Updates · Jun 16, 2026