ssh command crashes after key exchange Had this strange issue crop up today that I haven't experienced before. I execute ssh &lt;remote ip&gt; and ssh crashes with the following exception:

dyld: lazy symbol binding failed: Symbol not found: _timingsafe_bcmp
  Referenced from: /usr/local/bin/ssh
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: _timingsafe_bcmp
  Referenced from: /usr/local/bin/ssh
  Expected in: /usr/lib/libSystem.B.dylib

Abort trap: 6


I have run the command with the verbose flag and can see this is happening directly after the key exchange between the local machine and remote host.

Things I have tried:


Restarting terminal
Restarting machine
Removing all ssh programs in /usr/bin and replacing them with those of a colleagues mac
Booting to recovery mode and replacing libSystem.B.dylib with the one that ships with macOS
Installing openssh with homebrew
Removing openssh
Adding a PATH to /usr/bin


Note the same error appears on other commands such as scp.
Assuming that you're (probably) using homebrew's ssh, I found this reported bug in the openssh formula, which apparently can be fixed by upgrading macOS to 10.12.3:


  Right, that symbol wasn't in 10.12.0, […]
  You can fix it by building from source or by upgrading to 10.12.3.