async-nats vulnerable to TLS certificate common name validation bypass
The NATS official Rust clients are vulnerable to MitM when using TLS. The common name of the server's TLS certificate is validated against the hostname provided by the server's plaintext INFO message during the initial connection setup phase. A MitM proxy can tamper with the host field's value by substituting it with the common name of a valid certificate it controls, fooling the client into accepting it.