openssh: OpenSSH: Control characters in usernames can lead to code execution via ProxyCommand

A flaw was found in OpenSSH where control characters in usernames were not properly validated when sourced from untrusted inputs like the command line or configuration expansion. If a ProxyCommand is used, these control characters could modify command behavior, potentially leading to code executi...

CVE-2025-61984

CVE-2025-61984 affects OpenSSH before 10.1. It allows control characters in usernames originating from untrusted sources (command line or %-sequence expansion in a config file), potentially enabling code execution when a ProxyCommand is used. A config file that provides a complete literal usernam...