CVE-2026-33871
Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass
CVSS Score
0.0
EPSS Score
0.1%
EPSS Percentile
19th
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 |
| Vendor | netty |
| Product | netty |
| Published | Mar 27, 2026 |
| Last Updated | Mar 31, 2026 |
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Affected Versions
netty / netty
< 4.1.132.Final >= 4.2.0.Alpha1, < 4.2.10.Final