Version 11.0.3 (with fixes for odd use cases I never run into.. most notably FAT self-signed. Should be diamond solid)
You can find instructions on how to jailbreak your device using LiberiOS here:
● How to Jailbreak Your iPhone, iPad, and iPod Touch Using LiberiOS [iOS 11.0 - 11.1.2]
Notably, Cydia Substrate does not work with the LiberiOS jailbreak at this time. Saurik recently revealed that he is working with a well known developer to release a jailbreak of iOS 11.0 - 11.1.2 with a working Cydia and Cydia Substrate.
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Read More [Where to Download LiberiOS]