CVE-2026-56816

Published: Jul 21, 2026Modified: Aug 7, 2026

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: security-advisories@github.com (Secondary)

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.

Affected (1)

Products: Netty: Netty

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Netty Netty	From 4.2.2 to 4.2.16

Related CWEs

Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

References (3)

https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b

Source: security-advisories@github.com

Patch

https://github.com/netty/netty/releases/tag/netty-4.2.16.Final

Source: security-advisories@github.com

Release Notes

https://github.com/netty/netty/security/advisories/GHSA-hpcc-26xq-25fv

Source: security-advisories@github.com

ExploitVendor Advisory

Timeline

No history available yet.