Apple has released an update to the iOS mobile operating system that addresses the vulnerability that allowed jailbreaking on iPhones with the latest version of the OS.

The issue (CVE-2019-8605) discovered by Google Project Zero team member Ned Williamson is a post-release exploit vulnerability that could allow code with system privileges to run on the iOS kernel. This bug was fixed by Apple engineers in iOS 12.3, however, the company accidentally re-introduced the vulnerability in the release of iOS 12.4. IOS version 12.4.1 fixes this problem. Updates are also available for watchOS (5.3.1), tvOS ( 12.4.1 ) and macOS Mojave ( 10.14.6 ).

Last week, a researcher under the pseudonym Pwn20wnd published a jailbreak for iOS 12.4.