CVE-2026-55833

Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final and 4.2.16.Final, Netty SPDY header decoding continues inflating zlib-compressed header blocks after the raw header parser has exceeded `maxHeaderSize` and marked the frame truncated in `SpdyFrameCodec`, allowing a remote peer to send a small compressed `HEADERS` block that expands into much larger raw header data and causes compression-amplified CPU and allocation churn. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

• CWE-400

• https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003bPatch
• https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6Patch
• https://github.com/netty/netty/releases/tag/netty-4.1.136.FinalRelease Notes
• https://github.com/netty/netty/releases/tag/netty-4.2.16.FinalRelease Notes
• https://github.com/netty/netty/security/advisories/GHSA-mvh2-crg5-v77cExploit, Vendor Advisory

Published

Jul 21, 2026

Last Modified

Jul 23, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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