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High7.5Red Hat Linux

High [CVE-2026-33871] Denial of Service via HTTP/2 CONTINUATION frame flood

This high-severity Red Hat Linux advisory covers CVE-2026-33871 affecting Cryostat 4 on RHEL 9, Red Hat AMQ Broker 7.12.7, Red Hat AMQ Broker 7.13.5.

CVE-2026-33871 Published Mar 27, 2026
CVE-2026-33871
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

Denial of Service via HTTP/2 CONTINUATION frame flood. Red Hat rates this important (CVSS 7.5).

Weakness: CWE-770. Affected package(s): eap8-netty-transport-native-epoll, rhoai/odh-modelmesh-rhel9:1776756834, cryostat/jfr-datasource-rhel9:4.2.0, netty-codec-http, eap8-netty, cryostat/cryostat-rhel9:4.2.0.

Resolved in Red Hat advisory RHSA-2026:8509 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Cryostat 4 on RHEL 9; Red Hat AMQ Broker 7.12.7; Red Hat AMQ Broker 7.13.5; Red Hat AMQ Broker 7.14.0; and 27 more.

Affected versions
  • eap8-netty-transport-native-epoll-0:4.1.132-1.Final_redhat_00001.1.el8eap
  • rhoai/odh-modelmesh-rhel9:1776756834
  • cryostat/jfr-datasource-rhel9:4.2.0-9
  • netty-codec-http-4.1.100.Final.jar
  • eap8-netty-0:4.1.132-1.Final_redhat_00001.1.el8eap
  • eap8-netty-0:4.1.132-1.Final_redhat_00001.1.el9eap
  • eap8-netty-transport-native-epoll-0:4.1.132-1.Final_redhat_00001.1.el9eap
  • cryostat/cryostat-rhel9:4.2.0-9
  • devspaces/openvsx-rhel9:1776716842
  • devspaces/pluginregistry-rhel9:1776717247
  • netty-codec-http
  • devspaces/server-rhel9:1776796445

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • RHSA-2026:8509

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:8509 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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