For a very brief time on Thursday morning, the iOS 9 iBoot source code was availables freely on GitHub. A few hours later, Apple issued several DMCA notifications and "cleaned" repositories from GitHub.
But as most of us know, when something is published on the Internetnetwork, it is almost impossible to "pick it up". 
This probably also happened with iBoot, which is probably already on the computers of people who are interested in discovering valuables vulnerable points in Apple's source code.
Η Apple confirmed her leakage but according to the company due to the age of the code and other security measures used by the company, this particular leak is not a problem for the security of the devices.
Here is Apple's statement on CNET:
“The code appears to have been leaked three years ago, but by design the security of our products does not depend on the secrecy of the source code. There are many layers of hardware and software protected by our products and we always encourage customers to update to the latest software versions to take advantage of the latest features protections. ”
In other words, if you are using a device that runs with iOS 10 or later, you might not be in danger.
For those of you using an iOS device that can not upgrade over iOS 9, you probably need to think about an update on a newer device.
