According to a report from Engadget, Apple has confirmed to the publication that they are aware of the problem and will be issuing a fix. “We are aware of this issue and it will be addressed in an upcoming software update.” It is unclear when the update will be released and whether or not users will have to wait until iOS 11.3 or if it could be released sooner.
For those learning about this bug for the first time, basically even if you choose to disable previews in notifications, users can ask Siri to read their notifications out in which even those that are supposed to be hidden will be revealed. However it should be noted that this only seems to affect third-party apps and services, and that Apple’s own apps like Messages do not appear to have been affected by the bug.
While it’s not exactly a breaking bug, it is particularly concerning for those who might be sensitive about their privacy. Until a fix has been released, we suppose users who are worried about this can maybe try disabling Siri.