VULNERABILITY INTELLIGENCE

CVE-2026-56816

CVSS score7.5 HIGH
EPSS probability0.64%
CISA KEVNot currently listed
Published2026-07-21
Last modified2026-08-07
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • security-advisories@github.com: CWE-400

Primary references