Latest iOS 11.1 beta and watchOS, macOS, tvOS betas have WPA2 KRACK fix
It is unknown how quickly the patches for each platform will come to stable versions and if it can be expedited to a .0.x iteration. However, if either the device or the router is patched, you should be in the clear.
The KRACK exploit basically allows the manipulation of encryption keys. Your information can be easily siphoned and decrypted while being sent. Bad information can also be inserted into a receiving stream.
If you’re not enrolled in the Apple Beta Software Program and would like to, the source link below this story will get you there.