REDHAT-BUG-2503101: High severity Netty Netty vulnerability

Published Jul 21, 2026
·
Updated

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.

Affected Software

1 affected component
Netty Netty<4.1.136.Final, <4.2.16.Final

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade netty/spdy to a version that resolves this vulnerability.

    Fixed in 4.1.136.Final
  2. Upgrade

    Upgrade netty/spdy to a version that resolves this vulnerability.

    Fixed in 4.2.16.Final

Event History

Jul 21, 2026
Data Sourced
via Red Hat·12:01 AM
DescriptionSeverityAffected Software
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