CVE-2026-33871

EUVD-2026-16790

27.03.2026, 20:16

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7.5 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 63.21%

Affected Products (NVD)

Vendor	Product	Version
netty	netty	𝑥 < 4.1.132
netty	netty	4.2.0 ≤ 𝑥 < 4.2.10

𝑥

= Vulnerable software versions

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
Red Hat	Cryostat 4 on RHEL 9	4.2.0-9 ≤ 𝑥 < *	ADP
Red Hat	Cryostat 4 on RHEL 9	4.2.0-9 ≤ 𝑥 < *	ADP
Red Hat	Cryostat 4 on RHEL 9	4.2.0-9 ≤ 𝑥 < *	ADP
Red Hat	Red Hat AMQ Broker 7.12.7	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat AMQ Broker 7.13.5	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat AMQ Broker 7.14.0	codec-http ≤ 𝑥 < *	ADP
Red Hat	Red Hat AMQ Broker 7.14.0	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Build of Apache Camel 4.14 for Quarkus 3.27	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14	codec-http ≤ 𝑥 < *	ADP
Red Hat	Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat build of Quarkus 3.20.6	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat build of Quarkus 3.27.3	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Data Grid 8.6.1	codec-http ≤ 𝑥 < *	ADP
Red Hat	Red Hat Data Grid 8.6.1	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1	codec-http ≤ 𝑥 < *	ADP
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1	http-4.1.100.Final.jar ≤ 𝑥 < *	ADP
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	0:4.1.132-1.Final_redhat_00001.1.el8eap ≤ 𝑥 < *	ADP
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	0:4.1.132-1.Final_redhat_00001.1.el8eap ≤ 𝑥 < *	ADP
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	0:4.1.132-1.Final_redhat_00001.1.el9eap ≤ 𝑥 < *	ADP
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	0:4.1.132-1.Final_redhat_00001.1.el9eap ≤ 𝑥 < *	ADP
Red Hat	Streams for Apache Kafka 2.9.4	codec-http ≤ 𝑥 < *	ADP
Red Hat	Streams for Apache Kafka 2.9.4	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift AI 2.25	1776756834 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift Dev Spaces 3.27	1776716842 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift Dev Spaces 3.27	1776717247 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift Dev Spaces 3.27	1776796445 ≤ 𝑥 < *	ADP

Debian Releases

Debian Product

Codename

netty

bookworm	vulnerable
bookworm (security)	vulnerable
bullseye	vulnerable
bullseye (security)	vulnerable
forky	vulnerable
sid	vulnerable
trixie	vulnerable
trixie (security)	vulnerable

Ubuntu Releases

Ubuntu Product

Codename

netty

bionic	needs-triage
focal	needs-triage
jammy	needs-triage
noble	needs-triage
questing	ignored
resolute	needs-triage
trusty	needs-triage
xenial	ignored

openSUSE / SLES Releases

openSUSE Product

Release

netty-tcnative

suse enterprise desktop 15 SP7	2.0.75-150200.3.36.1 fixed
suse enterprise sap 15 SP7	2.0.75-150200.3.36.1 fixed
suse enterprise server 15 SP7	2.0.75-150200.3.36.1 fixed

Common Weakness Enumeration