CVE-2026-33871 (GCVE-0-2026-33871)

Vulnerability from cvelistv5 – Published: 2026-03-27 19:55 – Updated: 2026-06-30 12:07
VLAI
Title
Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass
Summary
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.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
URL Tags
https://github.com/netty/netty/security/advisorie… x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2026-33871 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2452456 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:18054 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17789 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18055 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14276 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14272 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8509 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8159 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22619 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18059 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:10184 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:10175 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17668 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7109 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7380 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13571 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
netty netty Affected: < 4.1.132.Final
Affected: >= 4.2.0.Alpha1, < 4.2.10.Final
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Red Hat Red Hat JBoss EAP 8.1 for RHEL 8     cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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Red Hat Cryostat 4 on RHEL 9     cpe:/a:redhat:cryostat:4::el9
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Red Hat Red Hat JBoss EAP 8.1 for RHEL 9     cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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Red Hat Red Hat AMQ Broker 7.12.7     cpe:/a:redhat:amq_broker:7.12
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Red Hat Red Hat AMQ Broker 7.13.5     cpe:/a:redhat:amq_broker:7.13
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Red Hat Red Hat AMQ Broker 7.14.0     cpe:/a:redhat:amq_broker:7.14
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Red Hat Red Hat Build of Apache Camel 4.14 for Quarkus 3.27     cpe:/a:redhat:apache_camel_quarkus:3.27
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Red Hat Red Hat Data Grid 8.6.1     cpe:/a:redhat:jboss_data_grid:8
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Red Hat Red Hat JBoss Enterprise Application Platform 8.1     cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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Red Hat Red Hat OpenShift AI 2.25     cpe:/a:redhat:openshift_ai:2.25::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.27     cpe:/a:redhat:openshift_devspaces:3.27::el9
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Red Hat Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14     cpe:/a:redhat:apache_camel_spring_boot:4.18
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Red Hat Red Hat build of Quarkus 3.20.6     cpe:/a:redhat:quarkus:3.20::el8
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Red Hat Red Hat build of Quarkus 3.27.3     cpe:/a:redhat:quarkus:3.27::el8
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Red Hat Streams for Apache Kafka 3.2.0     cpe:/a:redhat:amq_streams:3.2::el9
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Red Hat Cryostat 4     cpe:/a:redhat:cryostat:4
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Red Hat Logging Subsystem for Red Hat OpenShift     cpe:/a:redhat:logging:5
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Red Hat OpenShift Serverless     cpe:/a:redhat:serverless:1
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Red Hat Red Hat AMQ Clients     cpe:/a:redhat:amq_clients:2023
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Red Hat Red Hat build of Apache Camel - HawtIO 4     cpe:/a:redhat:apache_camel_hawtio:4
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Red Hat Red Hat build of Apache Camel 4 for Quarkus 3     cpe:/a:redhat:camel_quarkus:3
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Red Hat Red Hat build of Apicurio Registry 2     cpe:/a:redhat:service_registry:2
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Red Hat Red Hat build of Apicurio Registry 3     cpe:/a:redhat:apicurio_registry:3
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Red Hat Red Hat build of Debezium 2     cpe:/a:redhat:debezium:2
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Red Hat Red Hat build of Debezium 3     cpe:/a:redhat:debezium:3
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Red Hat Red Hat Build of Keycloak     cpe:/a:redhat:build_keycloak:
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Red Hat Red Hat build of OptaPlanner 8     cpe:/a:redhat:optaplanner:::el6
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Red Hat Red Hat build of Quarkus     cpe:/a:redhat:quarkus:3
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Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3     cpe:/a:redhat:enterprise_linux_ai:3
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Red Hat Red Hat Fuse 7     cpe:/a:redhat:jboss_fuse:7
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Red Hat Red Hat JBoss Enterprise Application Platform 7     cpe:/a:redhat:jboss_enterprise_application_platform:7
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Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat Process Automation 7     cpe:/a:redhat:jboss_enterprise_bpms_platform:7
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Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
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Red Hat streams for Apache Kafka 2     cpe:/a:redhat:amq_streams:2
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Red Hat Red Hat JBoss Enterprise Application Platform 8     cpe:/a:redhat:jboss_enterprise_application_platform:8
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Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
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Red Hat streams for Apache Kafka 3     cpe:/a:redhat:amq_streams:3
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-33871\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-31T18:51:31.168118Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-31T18:51:36.828Z\"}}], \"cna\": {\"title\": \"Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass\", \"source\": {\"advisory\": \"GHSA-w9fj-cfpg-grvv\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 8.7, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"netty\", \"product\": \"netty\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 4.1.132.Final\"}, {\"status\": \"affected\", \"version\": \"\u003e= 4.2.0.Alpha1, \u003c 4.2.10.Final\"}]}], \"references\": [{\"url\": \"https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv\", \"name\": \"https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv\", \"tags\": [\"x_refsource_CONFIRM\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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\u0027s 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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770: Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-03-27T19:55:23.135Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-33871\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-31T18:54:19.771Z\", \"dateReserved\": \"2026-03-24T15:10:05.679Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-03-27T19:55:23.135Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.