For a very short time, on Thursday morning, the iBoot source code of iOS 9 was freely available at 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 Internet, it is almost impossible to "collect" it. 
This probably happened with iBoot, which is probably already on computers of people who are interested in discovering valuable vulnerabilities in Apple's source code.
Η Apple confirmed the leakage but according to the company due to the age of the code and other security measures used by the company, this leakage is not a problem for the safety of the devices.
Here is Apple's statement on CNET:
"The code seems 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 that are protected by our products and we always encourage customers to keep up to date with the latest software versions to take advantage of the latest protection features. ”
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.
