I've just updated the Cygwin version of OpenSSH to 7.4p1-1.
This is primarily an upstream bugfix release.
Below's the original release message.
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OpenSSH 7.4 has just been released. It will be available from the
mirrors
An updated version of zsh (zsh-5.3-1) has been released and should be
at a mirror near you real soon. This is an upstream release.
NOTICE:
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Version 5.3 has just been released for both 32-bit and 64-bit Cygwin.
(Version 5.2 was skipped for stability reasons, but the change/release
info