Apple says it already has a fix for the security vulnerability which allows users to easily jailbreak their iPhones and other devices.
The software hack which allows iPhone owners to unlock their own handsets in minutes by simply downloading a modified PDF file from jailbreakme.com was deemed so serious that the German Government issued a warning to Apple fans, telling them not to open PDF files on their iDevices.
In a statement posted by Cnet, and Apple spokeswoman is reported to have said: "We're aware of this reported issue, we have already developed a fix and it will be available to customers in an upcoming software update."
Whether the Cupertino company will seed an off-schedule emergency patch, or fix the hole as part of the anticipated 4.1 update to iOS4, remains to be seen.
Reports indicate that the flaw is so serious that it allows potentially malicious code to break out of the system's protective sandbox and gain root privileges, which would seem to be borne out by the jaibreakme web-based hack.