CVE-2026-55833 – Netty SPDY zlib header block continues decoded expansion after maxHeaderSize truncation

CVE ID :CVE-2026-55833

Published : July 20, 2026, 11:18 p.m. | 26 minutes ago

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.

Severity: 0.0 | NA

Visit the link for more details, such as CVSS details, affected products, timeline, and more…