Insufficient verification of data authenticity in Netty - CVE-2026-44894
Published: June 8, 2026
Vulnerability identifier: #VU133453
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-44894
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Netty project
Affected software:
Netty
Netty
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass the QUIC anti-amplification limit and reflect handshake traffic to a spoofed victim.
The vulnerability exists due to improper token validation in NoQuicTokenHandler when handling QUIC Initial packets containing client-supplied token bytes. A remote attacker can send a specially crafted Initial packet with any non-empty token and a spoofed source IP address to bypass the QUIC anti-amplification limit and reflect handshake traffic to a spoofed victim.
The issue occurs when the application uses the default token handler instead of configuring its own token handler.
How to mitigate CVE-2026-44894
Install security update from vendor's website.