Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass
Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
cve-program · CVE-2026-33871
PublishedNetty 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.
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CVE-2026-33871 · CVE overview and exploitation status
cve-program · CVE-2026-33871
This historical advisory does not include today's related changes. Open the latest advisory to find current connections.