Safari iOS 26 user-agent freeze: what it means for attribution

Apple's iOS 26 update freezes the operating system version in Safari's user agent string, hiding current iOS versions from websites and measurement tools.
This change reduces granular signals for attribution platforms, potentially impacting install linking and event tracking accuracy.
AppsFlyer identified the issue during beta testing and implemented a forward-compatible solution combining frozen UA detection with version correction algorithms.
Their system now identifies static OS versions and restores attribution accuracy using device-level and aggregated signals.
For AppsFlyer customers, no action is required as the fix is already live, maintaining reliable attribution data despite platform privacy shifts.