Bug 2505424 (CVE-2026-56816) - CVE-2026-56816 io.netty:netty-codec-http3: Netty: Denial of Service due to uncontrolled memory buffering in HTTP/3
Summary: CVE-2026-56816 io.netty:netty-codec-http3: Netty: Denial of Service due to un...
Keywords:
Status: NEW
Alias: CVE-2026-56816
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-21 22:30 UTC by OSIDB Bzimport
Modified: 2026-09-15 04:36 UTC (History)
1 user (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-21 22:30:56 UTC 
Netty is a network application framework for development of protocol servers and clients. Prior to 4.2.16.Final, Netty's `Http3FrameCodec` buffers incoming data for HTTP/3 reserved frame types up to the wire-specified payload length without limits; `decodeFrame` trusts `payLoadLength`, allowing an attacker to open multiple QUIC streams and send reserved frames with very large payload lengths to cause memory exhaustion and denial of service. This issue is fixed in version 4.2.16.Final.
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