CVE-2026-56816 Details
Description
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.
A denial-of-service vulnerability has been identified in Netty's HTTP/3 handling, specifically in versions through 4.2.15.Final. The issue arises in the `Http3FrameCodec`, which buffers incoming data for reserved frame types based on the payload length specified by the sender, without any upper limit. This lack of validation allows an attacker to open multiple QUIC streams and send reserved frames with excessively large payloads, leading to memory exhaustion and a denial-of-service condition.
Users can upgrade to Netty version 4.2.16.Final or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 22, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| netty netty | >= 4.2.2, < 4.2.16 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 7, 2026 | Reanalysis | [email protected] |
| Jul 30, 2026 | Initial Analysis | [email protected] |
| Jul 22, 2026 | CVE Modified | CISA-ADP |
| Jul 21, 2026 | New CVE Received | [email protected] |