According to https://www.openwall.com/lists/oss-security/2023/12/18/3 the ssh client and server of the FreeBSD base system is vulnerable. Additionally, openssh-portable seems also vulnerable.
https://www.freebsd.org/security/advisories/FreeBSD-SA-23:19.openssh.asc
well that was fast :-D - great!
The advisory was published https://www.freebsd.org/security/advisories/ https://www.freebsd.org/security/advisories/FreeBSD-SA-23:19.openssh.asc