FKIE_CVE-2026-33871
Vulnerability from fkie_nvd - Published: 2026-03-27 20:16 - Updated: 2026-07-03 13:17
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
References
{
"affected": [
{
"affectedData": [
{
"product": "netty",
"vendor": "netty",
"versions": [
{
"status": "affected",
"version": "\u003c 4.1.132.Final"
},
{
"status": "affected",
"version": "\u003e= 4.2.0.Alpha1, \u003c 4.2.10.Final"
}
]
}
],
"source": "security-advisories@github.com"
},
{
"affectedData": [
{
"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 - HawtIO 4",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:camel_quarkus:3"
],
"defaultStatus": "affected",
"product": "Red Hat build of Apache Camel 4 for Quarkus 3",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:service_registry:2"
],
"defaultStatus": "affected",
"product": "Red Hat build of Apicurio Registry 2",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:apicurio_registry:3"
],
"defaultStatus": "affected",
"product": "Red Hat build of Apicurio Registry 3",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:debezium:2"
],
"defaultStatus": "affected",
"product": "Red Hat build of Debezium 2",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:debezium:3"
],
"defaultStatus": "affected",
"product": "Red Hat build of Debezium 3",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:build_keycloak:"
],
"defaultStatus": "affected",
"product": "Red Hat Build of Keycloak",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:optaplanner:::el6"
],
"defaultStatus": "affected",
"product": "Red Hat build of OptaPlanner 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quarkus:3"
],
"defaultStatus": "affected",
"product": "Red Hat build of Quarkus",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:enterprise_linux_ai:3"
],
"defaultStatus": "affected",
"product": "Red Hat Enterprise Linux AI (RHEL AI) 3",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:jboss_fuse:7"
],
"defaultStatus": "affected",
"product": "Red Hat Fuse 7",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:jbosseapxp"
],
"defaultStatus": "affected",
"product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openshift_ai"
],
"defaultStatus": "affected",
"product": "Red Hat OpenShift AI (RHOAI)",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:jboss_enterprise_bpms_platform:7"
],
"defaultStatus": "affected",
"product": "Red Hat Process Automation 7",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:red_hat_single_sign_on:7"
],
"defaultStatus": "affected",
"product": "Red Hat Single Sign-On 7",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:8"
],
"defaultStatus": "unaffected",
"product": "Red Hat JBoss Enterprise Application Platform 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6"
],
"defaultStatus": "unaffected",
"product": "Red Hat Satellite 6",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:amq_streams:3"
],
"defaultStatus": "unaffected",
"product": "streams for Apache Kafka 3",
"vendor": "Red Hat"
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
"matchCriteriaId": "8F551B7E-5E29-4062-8FDB-AA1377B3E8F5",
"versionEndExcluding": "4.1.132",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
"matchCriteriaId": "419E92FA-6271-4613-AF3D-CF09ADFF2E13",
"versionEndExcluding": "4.2.10",
"versionStartIncluding": "4.2.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"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."
}
],
"id": "CVE-2026-33871",
"lastModified": "2026-07-03T13:17:06.707",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"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"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"cvssData": {
"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"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-33871",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-31T18:51:31.168118Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-03-27T20:16:34.833",
"references": [
{
"source": "security-advisories@github.com",
"tags": [
"Vendor Advisory"
],
"url": "https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:10175"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:10184"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:13571"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:14272"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:14276"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:17668"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:17789"
},
{
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"url": "https://access.redhat.com/errata/RHSA-2026:18054"
},
{
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"url": "https://access.redhat.com/errata/RHSA-2026:18055"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:18059"
},
{
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"url": "https://access.redhat.com/errata/RHSA-2026:22619"
},
{
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"url": "https://access.redhat.com/errata/RHSA-2026:34608"
},
{
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"url": "https://access.redhat.com/errata/RHSA-2026:7109"
},
{
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"url": "https://access.redhat.com/errata/RHSA-2026:7380"
},
{
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"url": "https://access.redhat.com/errata/RHSA-2026:8159"
},
{
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"url": "https://access.redhat.com/errata/RHSA-2026:8509"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/security/cve/CVE-2026-33871"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452456"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33871.json"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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