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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| netty | netty | < 4.1.132.Final; >= 4.2.0.Alpha1, < 4.2.10.Final |
| Red Hat | Cryostat 4 on RHEL 9 | — |
| Red Hat | Cryostat 4 on RHEL 9 | — |
| Red Hat | Cryostat 4 on RHEL 9 | — |
| Red Hat | Red Hat AMQ Broker 7.12.7 | — |
| Red Hat | Red Hat AMQ Broker 7.13.5 | — |
| Red Hat | Red Hat AMQ Broker 7.14.0 | — |
| Red Hat | Red Hat Build of Apache Camel 4.14 for Quarkus 3.27 | — |
| Red Hat | Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14 | — |
| Red Hat | Red Hat build of Quarkus 3.20.6 | — |
| Red Hat | Red Hat build of Quarkus 3.27.3 | — |
| Red Hat | Red Hat Data Grid 8.6.1 | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 | — |
| Red Hat | Streams for Apache Kafka 2.9.4 | — |
| Red Hat | Streams for Apache Kafka 3.2.0 | — |
| Red Hat | Red Hat OpenShift AI 2.25 | — |
| Red Hat | Red Hat OpenShift AI 2.25 | — |
| Red Hat | Red Hat OpenShift Dev Spaces 3.27 | — |
| Red Hat | Red Hat OpenShift Dev Spaces 3.27 | — |
| Red Hat | Red Hat OpenShift Dev Spaces 3.27 | — |
| Red Hat | Cryostat 4 | — |
| Red Hat | Logging Subsystem for Red Hat OpenShift | — |
| Red Hat | Logging Subsystem for Red Hat OpenShift | — |
| Red Hat | Logging Subsystem for Red Hat OpenShift | — |
| Red Hat | Logging Subsystem for Red Hat OpenShift | — |
| Red Hat | Logging Subsystem for Red Hat OpenShift | — |
| Red Hat | Logging Subsystem for Red Hat OpenShift | — |
| Red Hat | OpenShift Serverless | — |
| Red Hat | OpenShift Serverless | — |
| Red Hat | OpenShift Serverless | — |
| Red Hat | OpenShift Serverless | — |
| Red Hat | OpenShift Serverless | — |
| Red Hat | OpenShift Serverless | — |
| Red Hat | OpenShift Serverless | — |
| Red Hat | OpenShift Serverless | — |
| Red Hat | OpenShift Serverless | — |
| Red Hat | OpenShift Serverless | — |
| Red Hat | Red Hat AMQ Clients | — |
| Red Hat | Red Hat build of Apache Camel 4 for Quarkus 3 | — |
| Red Hat | Red Hat build of Apache Camel 4 for Quarkus 3 | — |
| Red Hat | Red Hat build of Apache Camel - HawtIO 4 | — |
| Red Hat | Red Hat build of Apache Camel - HawtIO 4 | — |
| Red Hat | Red Hat build of Apicurio Registry 2 | — |
| Red Hat | Red Hat build of Apicurio Registry 2 | — |
| Red Hat | Red Hat build of Apicurio Registry 3 | — |
References
- https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvvVendor Advisory
- https://access.redhat.com/errata/RHSA-2026:10175
- https://access.redhat.com/errata/RHSA-2026:10184
- https://access.redhat.com/errata/RHSA-2026:13571
- https://access.redhat.com/errata/RHSA-2026:14272
- https://access.redhat.com/errata/RHSA-2026:14276
- https://access.redhat.com/errata/RHSA-2026:17668
- https://access.redhat.com/errata/RHSA-2026:17789
- https://access.redhat.com/errata/RHSA-2026:18054
- https://access.redhat.com/errata/RHSA-2026:18055
- https://access.redhat.com/errata/RHSA-2026:18059
- https://access.redhat.com/errata/RHSA-2026:22619
- https://access.redhat.com/errata/RHSA-2026:34608
- https://access.redhat.com/errata/RHSA-2026:65126
- https://access.redhat.com/errata/RHSA-2026:7109
- https://access.redhat.com/errata/RHSA-2026:7380
- https://access.redhat.com/errata/RHSA-2026:8159
- https://access.redhat.com/errata/RHSA-2026:8509
- https://access.redhat.com/security/cve/CVE-2026-33871
- https://bugzilla.redhat.com/show_bug.cgi?id=2452456
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33871.json
Timeline
- Published
- Mar 27, 2026
- Last modified
- Sep 14, 2026
- NVD status
- Modified