The Go SSH library (x/crypto/ssh) by default does not verify host keys, facilitating man-in-the-middle attacks. Default behavior changed in commit e4e2799 to require explicitly registering a hostkey verification mechanism.
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-3204.json"
[ { "events": [ { "introduced": "0" }, { "last_affected": "2017-03-17" } ] } ]