The hole in Safari has already been patched by Apple and they are preparing it for an upcoming software update, so make sure you back up your SHSH for your firmware so that you can restore back to it and use the JailbreakMe.com method to jailbreak your device. If your thinking of getting an iPhone 4 you better pick it up soon, because as soon as the new update is out you won’t be able to use the same exploit to jailbreak your phone.
On Wednesday an Apple spokeswoman said in a statement, “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.”
Sam's Blog 