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Vulnerabilities CVE-2026-33871

CVE-2026-33871

High
Open
TLP:CLEAR

Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass

NVD CVE.org
Ransomware DDoS

AI Analysis

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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.

Details

CVSS Score
8.7
EPSS Score
1.13%

63.3th percentile

CVSS Vector
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
Confidence
90%
Published
Mar 27, 2026
Last Modified
Aug 4, 2026
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