CVE-2026-102823 russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never opened

Russh is a Rust SSH client and server library. Prior to 0.63.1, clientreadauthenticated in russh/src/client/encrypted.rs forwards CHANNELDATA, CHANNELEXTENDEDDATA, CHANNELEOF, CHANNELCLOSE, CHANNELOPENFAILURE, CHANNELSUCCESS, CHANNELFAILURE, and CHANNELREQUEST subtypes exit-status, exit-signal, a...