Apple's latest iOS update reportedly undid a patch that was introduced in the previous release, a mistake that allowed a security researcher to publish a jailbreak for the most up-to-date version of the operating system.

The unpatched vulnerability is CVE-2019-8605, an arbitrary code execution bug caused by a use-after-free condition. Working in tandem with Google Project Zero, security researcher Ned Williamson discovered the flaw and then, after Apple had fixed it, published a working exploit named SockPuppet.

The May 13 release of iOS 12.3 had repaired the problem with improved memory management, but according to Motherboard, researcher and iPhone jailbreak specialist Pwn20wnd found that the fix was reversed with the July 22 release of iOS 12.4. The researcher then publicly posted a jailbreak for iOS 12.4 on Monday, via GitHub.

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