= CVE-2024-5594: control channel: refuse control channel messages with nonprintable characters in them.

Security scope: a malicious openvpn peer can send garbage to openvpn log, or cause high CPU load.

=== References
* Release notes: https://www.mail-archive.com/openvpn-users@lists.sourceforge.net/msg07634.html
* CVE record: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-5594
* Reported by: Reynir Björnsson