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A U.S. technology company says a vulnerability in iPhone messaging could allow the content of deleted messages to remain in the device’s local memory via the notification system. Apple has released iOS 26.4.2 to address the flaw, introducing a “better data hiding” mechanism for notifications that are marked as deleted but may still be stored on the device.
The issue, first reported by 404 Media, involves how deleted message notifications are handled. The concern is that deleted message content could persist locally and be exposed through the notification system rather than being fully removed.
Apple’s iOS 26.4.2 update adds a mechanism intended to handle notifications marked as deleted while still stored on the device. Signal CEO Meredith Whittaker said notifications for deleted messages should not continue to exist in the operating system’s notification database.
The article reports that the Federal Bureau of Investigation used digital-forensics tools to access deleted Signal notifications stored on iPhones. Signal had previously urged Apple to fix the issue.
According to the Electronic Frontier Foundation (EFF), notification privacy can be affected at two levels: in the cloud, where data passes through a provider’s servers, and on the device, where notifications are stored in local memory.
iOS 26.4.2 is available for iPhone models from iPhone 11 onward, along with many compatible iPads. Users are advised to update as soon as possible if supported and to review notification settings for messaging apps—particularly those that display the sender’s name or message content on the lock screen.
Before the update, Signal advised users to reduce exposure by adjusting how notifications are shown, including hiding the sender’s name or message content on the lock screen.
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