Yesterday, news broke of a new iOS bug that allows Siri to read your notifications aloud, even if you've got them set to hidden. Now Apple has responded to the issue.
Apple has said that it's aware of this bug and has told MacRumors that it'll be fixed in an upcoming software update. No other details were given, so it's unclear if Apple will roll a fix into the upcoming iOS 11.3 update or if we'll see a special iOS 11.2.7 update or something similar.
With this iOS bug, Siri will read your notifications even if they're set to be hidden. iOS allows you to have your notifications hidden on the lock screen until you unlock using Face ID, Touch ID, or a passcode by going into Settings > Notifications > Show Previews. However, it was recently discovered that if you ask Siri to read your notifications, it'll read the contents of your messages even if the notifications are hidden.
This is a pretty serious security issue, so it's good to hear that Apple is aware and working on a fix. Here's to hoping that the patch comes soon.