First, open this URL
Https://developer.apple.com/contact/app-store/?topic=expedite
See the following ,
Here we choose request an expedited app review to request an expedited review.
Second,Refine some data
such as contact Information,app information
Fill in the contact information, continue to fill out the app information, select AppStore
third, fill in the reasons for expedited audit
Here we generally choose critical bug fix a critical bug fix, pay attention to observe the following two lines of text, you will notice that we apply for expedited review, not sure to pass the audit, may be rejected by Apple audit staff. So when we describe this reason, for the sake of safety, we generally describe the problem of user security or crash, we should also describe the content of this issue clearly, and strive not to be rejected by Apple.
AppStore Expedited Review Process