Bug 2503103 (CVE-2026-55831) - CVE-2026-55831 io.netty/netty-codec-http: Netty: Denial of Service via SPDY SETTINGS frame processing
Summary: CVE-2026-55831 io.netty/netty-codec-http: Netty: Denial of Service via SPDY S...
Keywords:
Status: NEW
Alias: CVE-2026-55831
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 00:03 UTC by OSIDB Bzimport
Modified: 2026-09-16 17:17 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-2026:48118 0 None None None 2026-07-30 07:45:24 UTC
Red Hat Product Errata RHSA-2026:54622 0 None None None 2026-08-13 14:51:23 UTC
Red Hat Product Errata RHSA-2026:66488 0 None None None 2026-09-10 16:37:48 UTC
Red Hat Product Errata RHSA-2026:66545 0 None None None 2026-09-10 23:25:52 UTC
Red Hat Product Errata RHSA-2026:68333 0 None None None 2026-09-16 17:17:10 UTC

Description OSIDB Bzimport 2026-07-21 00:03:20 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's SPDY SETTINGS decoder accepts a peer-declared SETTINGS entry count up to the 24-bit frame-length limit and materializes every unique setting ID in `DefaultSpdySettingsFrame`, allowing a remote SPDY/3.1 peer to send a syntactically valid roughly 2 MiB SETTINGS frame that creates 262144 map entries and amplifies network input into heap growth and ordered-map insertion work. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
Comment 1 errata-xmlrpc 2026-07-30 07:45:18 UTC 
This issue has been addressed in the following products:

  Red Hat Build of Apache Camel 4.18 for Quarkus 3.33

Via RHSA-2026:48118 https://access.redhat.com/errata/RHSA-2026:48118
Comment 2 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 3 errata-xmlrpc 2026-09-10 16:37:42 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 4 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 5 Jon Orris 2026-09-16 17:17:05 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
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