The confidential source code to Apple's iBoot firmware on iOS devices was leaked on GitHub.
Motherboard's Lorenzo Franceschi-Bicchierai reported on Wednesday that someone posted the iBoot source code on a GitHub repository. The code had been posted by a new user on Reddit last year, but very few people took notice of it until the code was uploaded this week to GitHub, where anyone could find it.
Apple's iBoot source code is the program that loads iOS when the device turns on. It verifies the kernel is signed by Apple and then executes it. According to Motherboard, the code that was posted said it's for iOS 9, though it's likely aspects of it are still used in the current version, iOS 11.