Apple released iOS 26.3 to beta users, initiating tests of a new security update mechanism. This "Background Security Improvements" system deploys critical security patches rapidly without requiring a full iOS update.
The new system allows for targeted fixes to Safari, WebKit, and other system libraries. This capability significantly shortens the response time for addressing vulnerabilities. Apple aims to bring the speed of iPhone security responses in line with enterprise software standards.
The current beta release serves as an experimental test of the delivery system only and contains no actual security fixes itself. Apple is also testing the technology on iPadOS and macOS, indicating a broad future rollout across the ecosystem.