Netty WebSockets V07/V08 Handshaker Vulnerability: Early Warning
An early warning has been issued regarding a potential vulnerability in the Netty WebSockets V07/V08 handshaker that could allow HTTP request smuggling and protocol-confusion attacks.
What happened
Reportedly, an attacker can exploit the lax validation in the Netty WebSockets V07 or V08 handshaker by sending a `Sec-WebSocket-Version: 7` header and omitting the `Connection: Upgrade` and `Upgrade: websocket` headers. This could force a WebSocket upgrade that a proxy might not recognize as an Upgrade request, potentially enabling malicious activities. The affected component is the Netty library (maven). This issue is currently under investigation, and it is recommended to monitor for potential exploitation and apply patches as they become available. For more detailed information, consult the primary sources.
How 0Day mitigates this
netty is anywhere in your dependency tree, the engineers who own the affected repositories get a push alert the moment it is flagged — no manual audit to remember to run.Read how this differs from waiting on a scanner to catch a known advisory, or see the exact, read-only access 0Day needs to do this for an organization.