Russh: Channel-scoped server callbacks can be reached without an open channel

There is a server-side channel state issue in russh. After a client is authenticated, russh can dispatch channel-scoped handler callbacks for recipient channel IDs that were never opened or confirmed. In the strongest reproduced case, the client does not send SSHMSGCHANNELOPEN at all. It...

EUVD-2026-52337

Russh is a Rust SSH client & server library. Prior to 0.62.5, russh dispatches channel-scoped Handler callbacks for recipient channel IDs that were never opened or confirmed in russh/src/server/encrypted.rs, serverreadauthenticated, and the execrequest callback. Version 0.62.5 fixes the issue...