苹果强烈要求数亿iPhone用户升级至iOS 26，以应对高危安全威胁

Group 1 - Apple has accelerated its system upgrade strategy, requiring all iPhone 11 and newer users to migrate from iOS 18 to iOS 26 due to confirmed advanced persistent threat (APT) attacks targeting iPhones [1] - The originally planned iOS 18.7.3 update has been restricted to specific models like iPhone XS, XS Max, and XR, leaving a significant user base, especially those with iPhone 11 and later models, without critical security patches unless they upgrade to iOS 26 [3] - Current adoption rates for iOS 26 are low, with at least 50% of compatible devices not yet upgraded, while less than 10% of users are still on outdated models that do not meet upgrade criteria [3] Group 2 - The mobile security company Zimperium has reported that over half of mobile devices globally are running outdated operating system versions, making them vulnerable to cyberattacks [3] - Apple's decision for a mandatory upgrade is based on multiple exploited vulnerabilities, highlighting a "real and urgent" risk in the current security landscape [3] - The next version, iOS 26.3, is expected to be released in late January 2026, likely on January 26, and will include routine security vulnerability fixes [3]