If you’re on D8, core and probably a few modules will be updated tomorrow. If
you’re on D7, most likely several modules will be updated. Full Security
Announcement is below (but it really doesn’t say much, not that it should for
those self-same security implications).
As a FYI: Wednesdays are generally the day of the week Drupal updates are
released. The 3rd Wednesday of a month is usually when the majority of
Drupal security updates occur.