Description
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, a remote user can trigger a Denial of Service (DoS) against a Netty HTTP/2 server by sending a flood of `CONTINUATION` frames. The server's lack of a limit on the number of `CONTINUATION` frames, combined with a bypass of existing size-based mitigations using zero-byte frames, allows an user to cause excessive CPU consumption with minimal bandwidth, rendering the server unresponsive. Versions 4.1.132.Final and 4.2.10.Final fix the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| netty | netty | < 4.1.132.Final, >= 4.2.0.Alpha1, < 4.2.10.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 JBoss EAP 8 | eap8-activemq-artemis +14 | 2.40.0-6.redhat_00012.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-angus +1 | 2.0.5-1.redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-angus-activation | 2.0.3-1.redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-bouncycastle +5 | 1.84.0-1.redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-eap-product-conf-parent +1 | 801.6.0-1.GA_redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-guava +1 | 33.0.0-3.jre_redhat_00004.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-guava-failureaccess | 1.0.3-1.redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-hal-console | 3.7.19-1.Final_redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-hibernate +2 | 6.6.48-1.Final_redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-hibernate-search +6 | 7.2.6-1.Final_redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-jakarta-activation | 2.1.4-1.redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-jboss-logging | 3.6.2-1.Final_redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-jboss-metadata +5 | 16.1.0-1.Final_redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-jctools +1 | 4.0.6-1.redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-netty +14 | 4.1.132-1.Final_redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-plexus-utils | 3.6.1-1.redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-reactivex-rxjava | 3.1.12-1.redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-reactivex-rxjava2 | 2.2.21-5.redhat_00003.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-wildfly +3 | 8.1.6-5.GA_redhat_00007.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-wildfly-client-config | 1.0.1-4.Final_redhat_00002.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-wildfly-http-client +4 | 2.1.4-1.Final_redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-wildfly-javadocs | 8.1.1-10.GA_redhat_00017.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-wildfly-openssl +1 | 2.3.0-1.Final_redhat_00001.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-wildfly-openssl-el8-x86_64 | 2.3.0-1.Final.redhat.00001.1.el8eap | RHSA-2026:18054 |
| Red Hat JBoss EAP 8 | eap8-wildfly-openssl-el9-x86_64 | 2.3.0-1.Final_redhat_00001.1.el9eap | RHSA-2026:18055 |
| Red Hat JBoss EAP 8 | eap8-yasson | 3.0.4-5.redhat_00007.1.el8eap | RHSA-2026:18055, RHSA-2026:18054 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | netty | 4.1.132-150200.4.43.1 | SUSE-SU-2026:1353-1 |
| SLES 15 SP7 | netty-tcnative | 2.0.75-150200.3.36.1 | SUSE-SU-2026:1353-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | netty | 4.1.132-1.1 | openSUSE-SU-2026:10463-1 |
| openSUSE Leap 15.6 | netty | 4.1.132-150200.4.43.1 | SUSE-SU-2026:1353-1 |
| openSUSE Leap 15.6 | netty-tcnative | 2.0.75-150200.3.36.1 | SUSE-SU-2026:1353-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | akhq | 0.27.0-r0 | — |
| Wolfi rolling | apache-pulsar-4.2 | 4.2.1-r0 | — |
| Wolfi rolling | apicurio-registry | 3.2.0-r3 | — |
| Wolfi rolling | celeborn-0.6 | 0.6.2-r11 | — |
| Wolfi rolling | druid | 36.0.0-r12 | — |
| Wolfi rolling | flyway | 12.3.0-r0 | — |
| Wolfi rolling | infinispan-16.1 | 16.1.2-r2 | — |
| Wolfi rolling | keycloak-26.5 +2 | 26.5.6-r3 | — |
| Wolfi rolling | kserve-modelmesh | 0.12.0-r33 | — |
| Wolfi rolling | management-api-for-apache-cassandra-5.0 | 0.1.114-r1 | — |
| Wolfi rolling | neo4j-2025.10 +1 | No fix yet | — |
| Wolfi rolling | neo4j-2026.01 | 2026.01.4-r6 | — |
| Wolfi rolling | opensearch-3 +6 | 3.5.0-r3 | — |
| Wolfi rolling | opensearch-3-security-analytics | 3.6.0-r0 | — |
| Wolfi rolling | sonarqube | 26.7.0.124771-r0 | — |
| Wolfi rolling | spark-4.0-scala-2.13 | 4.0.2-r10 | — |
| Wolfi rolling | spark-4.1-scala-2.13 | 4.1.1-r11 | — |
| Wolfi rolling | strimzi-kafka-operator-kafka-thirdparty-libs-cc | 0.51.0-r7 | — |
| Wolfi rolling | thingsboard-tb-node +1 | 4.3.1-r5 | — |
| Wolfi rolling | trino-plugin-hive +11 | 480-r0 | — |
| Wolfi rolling | wavefront-proxy | 13.9-r11 | — |
| Wolfi rolling | wildfly-openjdk-17 +1 | 39.0.1-r3 | — |
| Wolfi rolling | zipkin +1 | 3.6.1-r1 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
iam-s21-caece/PoC-CVE-2026-33871 ★ 0 · Nov 6, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | io.netty:netty-codec-http2 | < 4.1.132.Final | 4.1.132.Final | GHSA-w9fj-cfpg-grvv |
| Maven | io.netty:netty-codec-http2 | >= 4.2.0.Alpha1, < 4.2.11.Final | 4.2.11.Final | GHSA-w9fj-cfpg-grvv |
Advisories 9
- RHSA-2026:18055 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.6 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:18054 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.6 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- WID-SEC-2026-0846 Netty: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 15, 2026
- WID-SEC-2026-2460 Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 1, 2026
- WID-SEC-2026-1955 Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 23, 2026
- WID-SEC-2026-1229 Atlassian Bamboo, Bitbucket, Confluence, Jira: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 2, 2026
- WID-SEC-2026-2260 IBM Operational Decision Manager: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 8, 2026
- SUSE-SU-2026:1353-1 Security update for netty, netty-tcnative SUSE / openSUSE Security Updates · Apr 16, 2026
- openSUSE-SU-2026:10463-1 netty-4.1.132-1.1 on GA media SUSE / openSUSE Security Updates · Mar 31, 2026