CVE-2025-43440: 
Apple Safari vulnerability analysis and mitigation

CVE-2025-43440 is a security vulnerability discovered in Apple's WebKit engine affecting multiple Apple operating systems and devices. The vulnerability was disclosed on November 3, 2025, and affects Safari 26.1, visionOS 26.1, watchOS 26.1, iOS 26.1, iPadOS 26.1, and tvOS 26.1. The issue involves processing maliciously crafted web content that could lead to an unexpected process crash (Apple Support iOS, Apple Support Safari).

The vulnerability is identified as a use-after-free issue in WebKit, Apple's web browser engine. The technical analysis reveals that the vulnerability could be triggered when processing maliciously crafted web content, potentially leading to an unexpected Safari crash. The issue was tracked in WebKit Bugzilla under ID 298126. The vulnerability has been assigned a CVSS 3.1 Base Score of 6.5 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H (NVD).

The primary impact of this vulnerability is the potential for unexpected process crashes when processing maliciously crafted web content. This affects users across multiple Apple platforms including Safari browser, iOS devices, iPadOS devices, Apple Vision Pro, Apple Watch, and Apple TV devices (Apple Support Safari, Apple Support iOS).

Apple has addressed this vulnerability by implementing improved checks in the affected systems. The fix is available in Safari 26.1, visionOS 26.1, watchOS 26.1, iOS 26.1 and iPadOS 26.1, and tvOS 26.1. Users are advised to update their devices to these versions to mitigate the vulnerability (Apple Support iOS, Apple Support Safari).