OpenSSH
9.6 has been released. It includes some minor improvements and a fix
for the so-called Terrapin
attack.

While cryptographically novel, the security impact of this attack
is fortunately very limited as it only allows deletion of
consecutive messages, and deleting most messages at this stage of
the protocol prevents user authentication from proceeding and
results in a stuck connection.

Source: LWN.net – OpenSSH 9.6 released