When doing SSH-based transfers using either SCP or SFTP, and setting the known_hosts file, libcurl could still mistakenly accept connecting to hosts not present in the specified file if they were added as recognized in the libssh global known_hosts file.
Exploitability
AV:NAC:HPR:NUI:RScope
S:UImpact
C:HI:NA:N5.3/CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N