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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."}],"source":{"advisory":"GHSA-w9fj-cfpg-grvv","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-31T18:51:31.168118Z","id":"CVE-2026-33871","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-31T18:54:19.771Z"}},{"affected":[{"cpes":["cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8"],"defaultStatus":"affected","product":"Red Hat JBoss EAP 8.1 for RHEL 8","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:cryostat:4::el9"],"defaultStatus":"affected","product":"Cryostat 4 on RHEL 9","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"],"defaultStatus":"affected","product":"Red Hat JBoss EAP 8.1 for RHEL 9","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:amq_broker:7.12"],"defaultStatus":"affected","product":"Red Hat AMQ Broker 7.12.7","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:amq_broker:7.13"],"defaultStatus":"affected","product":"Red Hat AMQ Broker 7.13.5","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:amq_broker:7.14"],"defaultStatus":"affected","product":"Red Hat AMQ Broker 7.14.0","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:apache_camel_quarkus:3.27"],"defaultStatus":"affected","product":"Red Hat Build of Apache Camel 4.14 for Quarkus 3.27","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:jboss_data_grid:8"],"defaultStatus":"affected","product":"Red Hat Data Grid 8.6.1","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"],"defaultStatus":"affected","product":"Red Hat JBoss Enterprise Application Platform 8.1","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:openshift_ai:2.25::el9"],"defaultStatus":"affected","product":"Red Hat OpenShift AI 2.25","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:openshift_devspaces:3.27::el9"],"defaultStatus":"affected","product":"Red Hat OpenShift Dev Spaces 3.27","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:apache_camel_spring_boot:4.18"],"defaultStatus":"affected","product":"Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:quarkus:3.20::el8"],"defaultStatus":"affected","product":"Red Hat build of Quarkus 3.20.6","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:quarkus:3.27::el8"],"defaultStatus":"affected","product":"Red Hat build of Quarkus 3.27.3","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:amq_streams:2.9::el9"],"defaultStatus":"affected","product":"Streams for Apache Kafka 2.9.4","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:amq_streams:3.2::el9"],"defaultStatus":"affected","product":"Streams for Apache Kafka 3.2.0","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:cryostat:4"],"defaultStatus":"affected","product":"Cryostat 4","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:logging:5"],"defaultStatus":"affected","product":"Logging Subsystem for Red Hat OpenShift","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:serverless:1"],"defaultStatus":"affected","product":"OpenShift Serverless","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:amq_clients:2023"],"defaultStatus":"affected","product":"Red Hat AMQ Clients","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:apache_camel_hawtio:4"],"defaultStatus":"affected","product":"Red Hat build of Apache Camel - 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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 these frames, coupled with a bypass of size-based mitigations using zero-byte frames, allows an attacker to consume excessive CPU resources. This can render the server unresponsive with minimal bandwidth usage."}],"metrics":[{"other":{"content":{"namespace":"https://access.redhat.com/security/updates/classification/","value":"Important"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}]}],"references":[{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-33871"},{"name":"RHBZ#2452456","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2452456"},{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33871.json"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:18054"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:17789"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:18055"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:14276"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:14272"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:8509"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:8159"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:22619"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:18059"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:10184"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:10175"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:17668"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:7109"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:7380"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:34608"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:13571"}],"solutions":[{"lang":"en","value":"RHSA-2026:18054: Red Hat JBoss EAP 8.1 for RHEL 8"},{"lang":"en","value":"RHSA-2026:17789: Cryostat 4 on RHEL 9"},{"lang":"en","value":"RHSA-2026:18055: Red Hat JBoss EAP 8.1 for RHEL 9"},{"lang":"en","value":"RHSA-2026:14276: Red Hat AMQ Broker 7.12.7"},{"lang":"en","value":"RHSA-2026:14272: Red Hat AMQ Broker 7.13.5"},{"lang":"en","value":"RHSA-2026:8509: Red Hat AMQ Broker 7.14.0"},{"lang":"en","value":"RHSA-2026:8159: Red Hat Build of Apache Camel 4.14 for Quarkus 3.27"},{"lang":"en","value":"RHSA-2026:22619: Red Hat Data Grid 8.6.1"},{"lang":"en","value":"RHSA-2026:18059: Red Hat JBoss Enterprise Application Platform 8.1"},{"lang":"en","value":"RHSA-2026:10184: Red Hat OpenShift AI 2.25"},{"lang":"en","value":"RHSA-2026:10175: Red Hat OpenShift Dev Spaces 3.27"},{"lang":"en","value":"RHSA-2026:17668: Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14"},{"lang":"en","value":"RHSA-2026:7109: Red Hat build of Quarkus 3.20.6"},{"lang":"en","value":"RHSA-2026:7380: Red Hat build of Quarkus 3.27.3"},{"lang":"en","value":"RHSA-2026:34608: Streams for Apache Kafka 2.9.4"},{"lang":"en","value":"RHSA-2026:13571: Streams for Apache Kafka 3.2.0"}],"timeline":[{"lang":"en","time":"2026-03-27T21:02:13.396Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-03-27T19:55:23.135Z","value":"Made public."}],"title":"netty: Netty: Denial of Service via HTTP/2 CONTINUATION frame flood","x_adpType":"supplier","x_generator":{"engine":"sadp-cli 1.0.0"},"providerMetadata":{"orgId":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","shortName":"redhat-SADP","dateUpdated":"2026-07-03T12:04:50.005Z"}}]}}