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High severity7.5NVD Advisory· Published Jul 21, 2026· Updated Jul 23, 2026

CVE-2026-55833

CVE-2026-55833

Description

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-httpMaven
>= 4.2.0.Final, < 4.2.16.Final4.2.16.Final
io.netty:netty-codec-httpMaven
>= 4.1.0.Final, < 4.1.136.Final4.1.136.Final

Affected products

243

Patches

Vulnerability mechanics

References

7

News mentions

0

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