Bug 2505980 (CVE-2026-56819) - CVE-2026-56819 io.netty/netty-codec-http2: Netty: Denial of Service via HTTP/2 DATA frame memory leak
Summary: CVE-2026-56819 io.netty/netty-codec-http2: Netty: Denial of Service via HTTP/...
Keywords:
Status: NEW
Alias: CVE-2026-56819
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 23:03 UTC by OSIDB Bzimport
Modified: 2026-07-30 07:45 UTC (History)
96 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-2026:48118 0 None None None 2026-07-30 07:45:42 UTC

Description OSIDB Bzimport 2026-07-21 23:03:59 UTC 
Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, a remote unauthenticated peer can leak one direct `ByteBuf` per HTTP/2 `DATA` frame in applications that enable HTTP/2 content decompression via `DelegatingDecompressorFrameListener`. When a `DATA` frame is processed for a stream whose decompressor has already been closed, `Http2Decompressor.decompress(...)` calls `decompressor.writeInbound(data.retain())` and does not release the retained buffer on the error path, eventually exhausting direct memory and crashing the JVM. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
Comment 1 errata-xmlrpc 2026-07-30 07:45:37 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
Note You need to log in before you can comment on or make changes to this bug.