CVE-2025-43359: 
macOS vulnerability analysis and mitigation

A logic issue in the Kernel component affecting multiple Apple operating systems was identified as CVE-2025-43359. The vulnerability was discovered by Viktor Oreshkin and disclosed on September 15, 2025. The issue affects iOS 26, iPadOS 26, macOS Tahoe 26, watchOS 26, tvOS 26, and visionOS 26, impacting a wide range of Apple devices including iPhones, iPads, Macs, Apple Watches, Apple TVs, and Apple Vision Pro (Apple Support).

The vulnerability is characterized by a logic issue where a UDP server socket bound to a local interface may become bound to all interfaces. The issue was addressed with improved state management in the Kernel component. This vulnerability affects the network stack implementation across Apple's operating systems (Apple Support).

When exploited, this vulnerability could potentially allow unauthorized access to network interfaces that should be restricted to local-only connections. This could lead to exposure of services intended to be accessible only through local interfaces to all network interfaces, potentially increasing the attack surface of affected devices (Apple Support).

Apple has addressed this vulnerability by implementing improved state management in the Kernel component. Users are advised to update to iOS 26, iPadOS 26, macOS Tahoe 26, watchOS 26, tvOS 26, or visionOS 26 depending on their device to receive the security fix (Apple Support).