CVE-2026-50009
MediumCVSS 4.8Exploitation Probability (EPSS)
Low risk10th percentile — higher than 10% of all known CVEs
Summary
Netty prior to version 4.2.15.Final exposes the stateless reset token on the network path, which can be exploited by an attacker to perform a Denial of Service attack.
Risk Assessment
Attackers can use the exposed token to send spoofed Stateless Reset packets, leading to service disruption.
Recommendation
It is recommended to upgrade Netty to version 4.2.15.Final or later to patch this vulnerability.
Original NVD description (English source)
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.