Apple has just released iOS 9.3.4 which kills the Pangu jailbreak used by many to jailbreak iOS 9.2 - iOS 9.3.3.
The security document for iOS 9.3.4 lists just one security issue resolved: an IOMobileFrameBuffer memory corruption issue used by Pangu Team to facilitate their jailbreak.
Available for: iPhone 4s and later, iPad 2 and later, iPod touch (5th generation) and later
Impact: An application may be able to execute arbitrary code with kernel privileges
Description: A memory corruption issue was addressed through improved memory handling.
CVE-2016-4654: Team Pangu
If you are jailbroken or looking to jailbreak make sure you do not accidentally update to iOS 9.3.4 or you will lose the ability to jailbreak your device.