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: 2026-10-06 07:26 UTC (History)
109 users (show)

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

Attachments (Terms of Use)


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
Red Hat Product Errata RHSA-2026:68333 0 None None None 2026-09-16 17:17:09 UTC
Red Hat Product Errata RHSA-2026:69296 0 None None None 2026-09-21 12:20:03 UTC
Red Hat Product Errata RHSA-2026:70228 0 None None None 2026-09-22 12:57:07 UTC
Red Hat Product Errata RHSA-2026:70229 0 None None None 2026-09-22 13:01:44 UTC
Red Hat Product Errata RHSA-2026:70230 0 None None None 2026-09-22 12:59:34 UTC
Red Hat Product Errata RHSA-2026:70277 0 None None None 2026-09-22 15:36:43 UTC
Red Hat Product Errata RHSA-2026:76637 0 None None None 2026-10-06 07:26:38 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
Comment 4 Jon Orris 2026-09-16 17:17:04 UTC 
This issue has been addressed in the following products:

  Cryostat 4 on RHEL 9

Via RHSA-2026:68333 https://access.redhat.com/errata/RHSA-2026:68333
Comment 5 Jon Orris 2026-09-21 12:19:57 UTC 
This issue has been addressed in the following products:

  Red Hat Data Grid 8.6.3

Via RHSA-2026:69296 https://access.redhat.com/errata/RHSA-2026:69296
Comment 6 Jon Orris 2026-09-22 12:57:02 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

Via RHSA-2026:70228 https://access.redhat.com/errata/RHSA-2026:70228
Comment 7 Jon Orris 2026-09-22 12:59:28 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

Via RHSA-2026:70230 https://access.redhat.com/errata/RHSA-2026:70230
Comment 8 Jon Orris 2026-09-22 13:01:37 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

Via RHSA-2026:70229 https://access.redhat.com/errata/RHSA-2026:70229
Comment 9 Jon Orris 2026-09-22 15:36:38 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1

Via RHSA-2026:70277 https://access.redhat.com/errata/RHSA-2026:70277
Comment 10 Jon Orris 2026-10-06 07:26:33 UTC 
This issue has been addressed in the following products:

  Red Hat build of Apicurio Registry 3.3.3

Via RHSA-2026:76637 https://access.redhat.com/errata/RHSA-2026:76637
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