An iOS 16 bug is reportedly causing the Mail application on iPhone and iPad models that have been upgraded to the latest version of Apple''s operating system to crash. The bug comes in the form of a normal-looking mail message, which contains additional characters that causes the Mail application to crash on iOS 16. The bug has been dubbed Mailjack and allows anyone outsider to keep their email accounts private.
Equinux''s VPN Tracker identified the crash-triggering email. Generally, the From field has the sender''s name followed by their email address from: ""@example.com. Mail services like Gmail, Outlook, and Hotmail automatically rewrite such inbound emails with unusual syntax to prevent such triggers.
Although Gmail and Yahoo have filters in place to stop these maliciously created emails altogether, Apple''s first-party iCloud Mail does not appear to have such rewriting or filtering methods in place, according to the findings.
The most effective way to avoid the trigger is to remove the message from the inbox or spam folder from a device that is running an older iOS version or via an external email client. Users may also go to another subfolder on an IMAP email account. However, navigating to the respective subfolder will cause the application to crash again according to the website. Admins may also add the syntax ""@example.com to their list of blocked emails via email security software or firewall.
Equinux''s VPN Tracker has created a dedicated webpage where users may test the bug trigger by entering their email address. However, users are advised not to try this because it might be withdrawn from their emails unless they have access to an older iOS or external email client to delete the trigger message.