Bug 2503101 (CVE-2026-55833) - CVE-2026-55833 netty: io.netty/netty-codec-http: Netty: Denial of Service via SPDY header decompression amplification
Summary: CVE-2026-55833 netty: io.netty/netty-codec-http: Netty: Denial of Service via...
Keywords:
Status: NEW
Alias: CVE-2026-55833
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-21 00:01 UTC by OSIDB Bzimport
Modified: 2026-09-10 23:25 UTC (History)
109 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:54622 0 None None None 2026-08-13 14:51:24 UTC
Red Hat Product Errata RHSA-2026:66488 0 None None None 2026-09-10 16:37:44 UTC
Red Hat Product Errata RHSA-2026:66545 0 None None None 2026-09-10 23:25:50 UTC

Description OSIDB Bzimport 2026-07-21 00:01:48 UTC 
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.
Comment 1 errata-xmlrpc 2026-08-13 14:51:18 UTC 
This issue has been addressed in the following products:

  Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16

Via RHSA-2026:54622 https://access.redhat.com/errata/RHSA-2026:54622
Comment 2 errata-xmlrpc 2026-09-10 16:37:39 UTC 
This issue has been addressed in the following products:

  Red Hat AMQ Broker 7.14.1

Via RHSA-2026:66488 https://access.redhat.com/errata/RHSA-2026:66488
Comment 3 errata-xmlrpc 2026-09-10 23:25:45 UTC 
This issue has been addressed in the following products:

  Red Hat AMQ Broker 7.13.6

Via RHSA-2026:66545 https://access.redhat.com/errata/RHSA-2026:66545
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