{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-33871", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-24T15:10:05.679Z", "datePublished": "2026-03-27T19:55:23.135Z", "dateUpdated": "2026-08-18T12:05:23.553Z" }, "containers": { "cna": { "title": "Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass", "problemTypes": [ { "descriptions": [ { "cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE" } ] } ], "metrics": [ { "cvssV4_0": { "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "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", "version": "4.0" } } ], "references": [ { "name": "https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv", "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv" } ], "affected": [ { "vendor": "netty", "product": "netty", "versions": [ { "version": "< 4.1.132.Final", "status": "affected" }, { "version": ">= 4.2.0.Alpha1, < 4.2.10.Final", "status": "affected" } ] } ], "providerMetadata": { "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-27T19:55:23.135Z" }, "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'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": [ { "collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": [ "cpe:/a:redhat:cryostat:4::el9" ], "defaultStatus": "affected", "packageName": "cryostat/cryostat-reports-rhel9", "product": "Cryostat 4 on RHEL 9", "vendor": "Red Hat", "versions": [ { "lessThan": "*", "status": "unaffected", "version": "4.2.0-9", "versionType": "rpm" } ] }, { "collectionURL": 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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": "2026-08-18T12:05:23.553Z" } } ] } }