https://www.bleepingcomputer.com/news/apple/checkra1n-ios-jailbreak-gets-public-beta-update-with-fixes/

A public early beta preview of the semi-tethered checkra1n iOS jailbreak based on the iOS Checkm8 exploit developed by security researcher Axi0mX in September was released over the weekend.

checkra1n can be used to jailbreak all iOS devices running up to iOS 12.3 between the iPhone 5s and the iPhone X, with the addendum that this beta version currently does not support iPad Air 2, iPad 5th Gen, and iPad Pro 1st Gen.