From the ssh man page: Agent forwarding should be enabled with caution. Users with the ability to bypass file permissions on the remote host (for the agent’s U

From the ssh man page: Agent forwarding should be enabled with caution. Users with the ability to bypass file permissions on the remote host (for the agent’s UNIX-domain socket) can access the local agent through the forwarded connection. An attacker cannot obtain key material from the agent, however they can perform operations on the keys that enable them to authenticate using the identities loaded into the agent.