Netty: Memory Exhaustion via HTTP/3 Reserved Frame Types

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-56816
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-21 22:17:14 UTC
Updated2026-07-22 20:35:40 UTC
DescriptionNetty 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.006090000 probability, percentile 0.454760000 (date 2026-07-22)

Problem Types: CWE-400 | CWE-400 CWE-400: Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Netty Netty affected < 4.2.16.Final Not specified

References

ReferenceSourceLinkTags
github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b [email protected] github.com
github.com/netty/netty/releases/tag/netty-4.2.16.Final [email protected] github.com
github.com/netty/netty/security/advisories/GHSA-hpcc-26xq-25fv [email protected] github.com
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