iOS 26.3.1 (a): Apple's First Background Security Improvement Fixes This On Your iPhone

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Apple has released new security updates that resolve over 80 vulnerabilities across iOS, iPadOS, macOS, watchOS, and visionOS.

Macworld highlights that iOS 26.4 and iPadOS 26.4 contain nearly 40 critical security and privacy fixes addressing vulnerabilities from app data leaks to Keychain access issues. The updates include four kernel patches and major WebKit security fixes,

Apple's new Background Security Improvements operate between software updates, providing "lightweight security releases."

Apple has released the 26.4 updates to all of its major software platforms today, including iOS, iPadOS, macOS Tahoe, watchOS, tvOS, visionOS, and the HomePod. The most important reason to install each update is the big pile of included security fixes—you can see the ones Apple is disclosing for iOS/iPadOS and macOS on its security website—but the updates also include a few significant new features,