Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass
Summary
| CVE | CVE-2026-33871 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-03-27 20:16:34 UTC |
| Updated | 2026-07-15 02:20:21 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v4.0 8.7 HIGH from [email protected]
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
Problem Types: CWE-770 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling | CWE-770 Allocation of Resources Without Limits or Throttling
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 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/E:X/C... |
| 4.0 | CNA | DECLARED | 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 |
| 3.1 | [email protected] | Primary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | ADP | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
NonePrivileges Required
NoneUser Interaction
NoneConfidentiality
NoneIntegrity
NoneAvailability
HighSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS: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
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Netty | Netty | affected < 4.1.132.Final | Not specified |
| CNA | Netty | Netty | affected >= 4.2.0.Alpha1, < 4.2.10.Final | Not specified |
| ADP | Red Hat | Cryostat 4 On RHEL 9 | unaffected 4.2.0-9 * rpm | Not specified |
| ADP | Red Hat | Cryostat 4 On RHEL 9 | unaffected 4.2.0-9 * rpm | Not specified |
| ADP | Red Hat | Cryostat 4 On RHEL 9 | unaffected 4.2.0-9 * rpm | Not specified |
| ADP | Red Hat | Red Hat AMQ Broker 7.12.7 | unaffected codec-http2 * rpm | Not specified |
| ADP | Red Hat | Red Hat AMQ Broker 7.13.5 | unaffected codec-http2 * rpm | Not specified |
| ADP | Red Hat | Red Hat AMQ Broker 7.14.0 | unaffected codec-http * rpm | Not specified |
| ADP | Red Hat | Red Hat AMQ Broker 7.14.0 | unaffected codec-http2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Apache Camel 4.14 For Quarkus 3.27 | unaffected codec-http2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Apache Camel 4.18.1 For Spring Boot 3.5.14 | unaffected codec-http * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Apache Camel 4.18.1 For Spring Boot 3.5.14 | unaffected codec-http2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Quarkus 3.20.6 | unaffected codec-http2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Quarkus 3.27.3 | unaffected codec-http2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Data Grid 8.6.1 | unaffected codec-http * rpm | Not specified |
| ADP | Red Hat | Red Hat Data Grid 8.6.1 | unaffected codec-http2 * rpm | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 | unaffected codec-http * rpm | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 | unaffected http-4.1.100.Final.jar * rpm | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 For RHEL 8 | unaffected 0:4.1.132-1.Final_redhat_00001.1.el8eap * rpm | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 For RHEL 8 | unaffected 0:4.1.132-1.Final_redhat_00001.1.el8eap * rpm | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 For RHEL 9 | unaffected 0:4.1.132-1.Final_redhat_00001.1.el9eap * rpm | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 For RHEL 9 | unaffected 0:4.1.132-1.Final_redhat_00001.1.el9eap * rpm | Not specified |
| ADP | Red Hat | Streams For Apache Kafka 2.9.4 | unaffected codec-http * rpm | Not specified |
| ADP | Red Hat | Streams For Apache Kafka 2.9.4 | unaffected codec-http2 * rpm | Not specified |
| ADP | Red Hat | Streams For Apache Kafka 3.2.0 | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 2.25 | unaffected 1776756834 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Dev Spaces 3.27 | unaffected 1776716842 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Dev Spaces 3.27 | unaffected 1776717247 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Dev Spaces 3.27 | unaffected 1776796445 * rpm | Not specified |
| ADP | Red Hat | Cryostat 4 | Not specified | Not specified |
| ADP | Red Hat | Logging Subsystem For Red Hat OpenShift | Not specified | Not specified |
| ADP | Red Hat | Logging Subsystem For Red Hat OpenShift | Not specified | Not specified |
| ADP | Red Hat | Logging Subsystem For Red Hat OpenShift | Not specified | Not specified |
| ADP | Red Hat | Logging Subsystem For Red Hat OpenShift | Not specified | Not specified |
| ADP | Red Hat | Logging Subsystem For Red Hat OpenShift | Not specified | Not specified |
| ADP | Red Hat | Logging Subsystem For Red Hat OpenShift | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | Red Hat AMQ Clients | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Apache Camel 4 For Quarkus 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Apache Camel 4 For Quarkus 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Apache Camel - HawtIO 4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Apache Camel - HawtIO 4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Apicurio Registry 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Apicurio Registry 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Apicurio Registry 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Apicurio Registry 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Debezium 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Debezium 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Debezium 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Debezium 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of OptaPlanner 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of OptaPlanner 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Quarkus | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AI RHEL AI 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AI RHEL AI 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AI RHEL AI 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Fuse 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Fuse 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat Process Automation 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Process Automation 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Satellite 6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Satellite 6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Single Sign-On 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Single Sign-On 7 | Not specified | Not specified |
| ADP | Red Hat | Streams For Apache Kafka 3 | Not specified | Not specified |
| ADP | Red Hat | Streams For Apache Kafka 3 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:14276 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7380 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:18054 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:17668 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8509 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:18059 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:10184 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-33871 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:34608 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:10175 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33871.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8159 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:14272 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:13571 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7109 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:18055 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22619 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:17789 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv | [email protected] | github.com | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-03-27T21:02:13.396Z | Reported to Red Hat. |
| ADP | 2026-03-27T19:55:23.135Z | Made public. |
Solutions
ADP: RHSA-2026:18054: Red Hat JBoss EAP 8.1 for RHEL 8
ADP: RHSA-2026:17789: Cryostat 4 on RHEL 9
ADP: RHSA-2026:18055: Red Hat JBoss EAP 8.1 for RHEL 9
ADP: RHSA-2026:14276: Red Hat AMQ Broker 7.12.7
ADP: RHSA-2026:14272: Red Hat AMQ Broker 7.13.5
ADP: RHSA-2026:8509: Red Hat AMQ Broker 7.14.0
ADP: RHSA-2026:8159: Red Hat Build of Apache Camel 4.14 for Quarkus 3.27
ADP: RHSA-2026:22619: Red Hat Data Grid 8.6.1
ADP: RHSA-2026:18059: Red Hat JBoss Enterprise Application Platform 8.1
ADP: RHSA-2026:10184: Red Hat OpenShift AI 2.25
ADP: RHSA-2026:10175: Red Hat OpenShift Dev Spaces 3.27
ADP: RHSA-2026:17668: Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14
ADP: RHSA-2026:7109: Red Hat build of Quarkus 3.20.6
ADP: RHSA-2026:7380: Red Hat build of Quarkus 3.27.3
ADP: RHSA-2026:34608: Streams for Apache Kafka 2.9.4
ADP: RHSA-2026:13571: Streams for Apache Kafka 3.2.0
There are currently no legacy QID mappings associated with this CVE.