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CVE PROGRAM SOURCE RECORD8.7 High

CVE-2026-33871

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

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Status
Published
Published
Updated
Assigning organization
GitHub_M

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

netty netty

  • < 4.1.132.Finalaffected
  • >= 4.2.0.Alpha1, < 4.2.10.Finalaffected

References