It's "critically important" that anyone with an Apple phone, tablet, computer or watch to update their device software as soon as possible, Newstalk's Jess Kelly says.
This applies to all of the company's devices - including iPhones, iPads, Apple Watches and MacBooks.
Yesterday, Apple released major security updates to cover all their main devices.
In their software release notes, the tech giant said they were addressing a vulnerability where a "maliciously crafted" PDF or web content could be used by hackers to access a device.
Crucially, the problem in question, which was identified by independent researchers in Canada, meant a device could be accessed without the user actually clicking on any document - a so-called 'zero-click exploit'.
Apple has said it's aware of a report the issue "may have been actively exploited".
On The Pat Kenny Show, Newstalk's technology correspondent Jess Kelly explained why this update is such a big deal.
She said: “If you have an Apple device... you need to update your software.
“This is an emergency software update that’s been pushed by Apple in the last day or so. It’s because a critical weakness within the infrastructure of the operating systems has been identified. Security researchers have found that if you don’t update your software, it could be vulnerable to Pegasus software.
“This is spyware that malicious actors could push onto your device without you knowing it. It’s called zero-click software.
"They can get access to your phone calls, your photographs... anything your device can do, essentially."
Jess urged people who have an Apple device to make sure they install the update that has now been pushed out by Apple.
She said: "The maximum it will take is ten minutes, but it is critically important that you do it.”
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