Cydia Impactor is a utility created by Saurik (Jay Freeman) for side-loading apps onto your iPhone or iPad; it’s commonly used by semi-untethered jailbreak solutions to install the app that hacks your device.
That said, it’s no surprise that we’re seeing updates for the utility following the launch of the unc0ver jailbreak tool for iOS 11.0-11.4 beta 3. Saurik quietly released two updates for Cydia Impactor on two separate occasions over the weekend with bug fixes and performance improvements.