VULNERABILITY INTELLIGENCE

CVE-2026-50009

CVSS score4.8 MEDIUM
EPSS probability0.20%
CISA KEVNot currently listed
Published2026-06-12
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

Description

Netty is a network application framework for development of protocol servers and clients. Prior to version 4.2.15.Final, Netty QUIC exposes the stateless reset token on the network path when using the default HMAC-based connection-ID and stateless-reset-token generators. The reset token for the server's current source connection ID can be derived from bytes that appear as the connection ID in QUIC headers after a source-CID rotation. An on-path attacker observing the headers can use the token to perform a Denial of Service by sending a spoofed Stateless Reset packet. Version 4.2.15.Final patches the issue.

Weakness classification

  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-330: Use of Insufficiently Random Values

Primary references