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CVE-2026-33871: Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass

High · CVSS 7.5 (CVSS 3.1)EPSS 1.1%, 67th percentilePublished Updated Assigner: GitHub_M

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.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · CWE-770

Tracked companies

BitbucketConfluenceJira

Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

netty: nettyRed Hat: Cryostat 4Red Hat: Logging Subsystem for Red Hat OpenShiftRed Hat: Red Hat AMQ Broker 7.12.7Red Hat: Red Hat AMQ Broker 7.13.5Red Hat: Red Hat AMQ Broker 7.14.0Red Hat: Red Hat AMQ ClientsRed Hat: Red Hat Build of Apache Camel 4.14 for Quarkus 3.27Red Hat: Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14Red Hat: Red Hat build of Apache Camel 4 for Quarkus 3Red Hat: Red Hat build of Apache Camel - HawtIO 4Red Hat: Red Hat build of Apicurio Registry 3Red Hat: Red Hat build of Debezium 2Red Hat: Red Hat build of Debezium 3Red Hat: Red Hat Build of KeycloakRed Hat: Red Hat build of OptaPlanner 8Red Hat: Red Hat build of QuarkusRed Hat: Red Hat build of Quarkus 3.20.6Red Hat: Red Hat Data Grid 8.6.1Red Hat: Red Hat Enterprise Linux AI (RHEL AI) 3Red Hat: Red Hat Fuse 7Red Hat: Red Hat JBoss Enterprise Application Platform 7Red Hat: Red Hat JBoss Enterprise Application Platform 8Red Hat: Red Hat JBoss Enterprise Application Platform 8.1Red Hat: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat: Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat: Red Hat OpenShift AI (RHOAI)Red Hat: Red Hat Process Automation 7Red Hat: Streams for Apache Kafka 2.9.4Red Hat: streams for Apache Kafka 3Red Hat: Streams for Apache Kafka 3.2.0

References

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