GO-2021-0356 Denial of service via crafted Signer in golang.org/x/crypto/ssh

Attackers can cause a crash in SSH servers when the server has been configured by passing a Signer to ServerConfig.AddHostKey such that 1 the Signer passed to AddHostKey does not implement AlgorithmSigner, and 2 the Signer passed to AddHostKey returns a key of type “ssh-rsa” from its PublicKey...