Today, Apple released the latest update for its mobile devices, and it comes in the form of iOS 15.3 and iPadOS 15.3. These should already be available for devices that are still supported and should be installed as soon as possible as they fix actively exploited bugs related to memory corruption.
Basically, a well-formatted malicious website can spy on other websites you visit while Safari is open, and since some websites use user-specific identifiers in their database names, even personal information can be leaked this way.
Needless to say, this sucks, and since Apple forces third-party browsers on iOS and iPadOS to use its rendering engine, this affects not only Safari, but other browsers like Chrome. There are other bugs fixed in iOS 15.3 and iPadOS 15.3, you can find the full list in the source linked below. While this update doesn’t bring any new features, the number of security issues it fixes definitely deserve your attention.
If your iPhone or iPad hasn’t notified you of a new update and you’re eager to get it quickly, just go to Settings > General > Software Update on your device.