Bug 2488407 (CVE-2026-50560) - CVE-2026-50560 netty-codec-http2: Netty: Denial of Service due to HTTP/2 max header size handling
Summary: CVE-2026-50560 netty-codec-http2: Netty: Denial of Service due to HTTP/2 max ...
Keywords:
Status: NEW
Alias: CVE-2026-50560
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-12 16:01 UTC by OSIDB Bzimport
Modified: 2026-08-04 14:00 UTC (History)
95 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:50085 0 None None None 2026-08-04 14:00:40 UTC

Description OSIDB Bzimport 2026-06-12 16:01:22 UTC
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty HTTP/2 max header size handling produces an attack similar to HTTP/2 Rapid Reset. There is a setting in the http2 specification called `SETTINGS_MAX_HEADER_LIST_SIZE`. When a client sends that setting to Netty, it appears that Netty will behave as follows: read the request; proxy the request to the origin; attempt to produce a response; and create an exception while writing the headers for the response. Functionally, this should be similar to the http2 reset attack, but with a different on-the-wire signature. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Comment 3 errata-xmlrpc 2026-08-04 14:00:34 UTC
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1

Via RHSA-2026:50085 https://access.redhat.com/errata/RHSA-2026:50085


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