CVE-2026-33871

high Red Hat
CVSS v3 Base Score
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.0%
Exploitation probability in 30 days
Top 89% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Published: March 27, 2026 (105 days ago)
Last Modified: March 27, 2026
Vendor: Red Hat
Fix Available: ✓ Yes
Source: REDHAT

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.

CWE

CWE-770

Affected Products

Cryostat 4Logging Subsystem for Red Hat OpenShiftOpenShift ServerlessRed Hat AMQ ClientsRed Hat build of Apache Camel 4 for Quarkus 3Red Hat build of Apache Camel - HawtIO 4Red Hat build of Apicurio Registry 2Red Hat build of Apicurio Registry 3Red Hat build of Debezium 2Red Hat build of Debezium 3

Fix Status

✅ Fix Available

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 github.com