CVE-2026-9547

When a libcurl-based application performs transfers via `SCP://` or `SFTP://`

and utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an

untrusted server. This vulnerability occurs when a server presents a host key

type that does not match the specific key type already recorded for that host

in the `known_hosts` file. Instead of rejecting the mismatch, the callback

mechanism fails to properly enforce the restriction, allowing the connection

to succeed without warning and risking a potential man-in-the-middle attack.