Adding a private key doesn't prompt for its password

[gabriel-r]

Describe the bug
I'm adding a bookmark for a server that uses SFTP, with a key pair that requires a password. However, the password is never required and the server rejects the connection.

To Reproduce
Steps to reproduce the behavior:

1. Generate a ssh-ed25519 key pair. Enter a password when prompted, e.g. 123abc
2. Set it up on the server side, test the connection in the terminal with SSH
3. Add a bookmark for the server in Cyberduck
4. Select the key in the SSH Private Key field

Expected behavior
A prompt for the password, as described here https://www.sfc.itc.keio.ac.jp/en/network_cns_remote_scp_cyberduck.html

Screenshots

Desktop (please complete the following information):

• OS: 15.7.4 (24G517)
• Version 9.4.1 (44384)

Log Files

2026-03-18 13:40:04,417 [sshj-Reader-/77.42.30.157:22-1773837603751] ERROR net.schmizz.sshj.transport.TransportImpl - Dying because - Too many authentication failures
net.schmizz.sshj.transport.TransportException: Too many authentication failures
	at net.schmizz.sshj.transport.TransportImpl.gotDisconnect(TransportImpl.java:549)
	at net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:501)
	at net.schmizz.sshj.transport.Decoder.decode(Decoder.java:113)
	at net.schmizz.sshj.transport.Decoder.received(Decoder.java:200)
	at net.schmizz.sshj.transport.Reader.run(Reader.java:60)
2026-03-18 13:40:04,419 [Thread-109] ERROR net.schmizz.concurrent.Promise - <<authenticated>> woke to: net.schmizz.sshj.userauth.UserAuthException: Too many authentication failures
2026-03-18 13:40:05,245 [sshj-Reader-/77.42.30.157:22-1773837604633] ERROR net.schmizz.sshj.transport.TransportImpl - Dying because - Too many authentication failures
net.schmizz.sshj.transport.TransportException: Too many authentication failures
	at net.schmizz.sshj.transport.TransportImpl.gotDisconnect(TransportImpl.java:549)
	at net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:501)
	at net.schmizz.sshj.transport.Decoder.decode(Decoder.java:113)
	at net.schmizz.sshj.transport.Decoder.received(Decoder.java:200)
	at net.schmizz.sshj.transport.Reader.run(Reader.java:60)
2026-03-18 13:40:05,246 [Thread-109] ERROR net.schmizz.concurrent.Promise - <<authenticated>> woke to: net.schmizz.sshj.userauth.UserAuthException: Too many authentication failures

Additional context

• I have enabled the SSH Keychain integration ssh-add --apple-use-keychain ~/.ssh/<key>
• I tried deactivating the Keychain in Cyberduck, no change