CVE-2025-43211: 
Apple Safari vulnerability analysis and mitigation

CVE-2025-43211 is a security vulnerability discovered in Apple's WebKit browser engine that affects multiple Apple operating systems and devices. The vulnerability was disclosed on July 29, 2025, and fixed in Safari 18.6, macOS Sequoia 15.6, iPadOS 17.7.9, iOS 18.6, iPadOS 18.6, tvOS 18.6, watchOS 11.6, and visionOS 2.6. The issue was identified by researchers Yuhao Hu, Yan Kang, Chenggang Wu, and Xiaojie Wei (Apple Security).

The vulnerability is related to memory handling issues in WebKit's processing of web content. When exploited, it can lead to a denial-of-service condition. The issue was addressed with improved memory handling implementations. The vulnerability has been assigned a CVSS v3.1 base score of 6.2 (Medium) with the vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, indicating local access is required but no privileges or user interaction are needed to exploit it (NVD).

When successfully exploited, the vulnerability can cause a denial-of-service condition through processing web content. This could lead to unexpected crashes or system instability in affected applications using WebKit (Apple Security, Ubuntu Security).

Apple has released security updates to address this vulnerability across multiple platforms. Users should update to Safari 18.6, macOS Sequoia 15.6, iPadOS 17.7.9, iOS 18.6, iPadOS 18.6, tvOS 18.6, watchOS 11.6, or visionOS 2.6 depending on their device. The fix implements improved memory handling to prevent the denial-of-service condition (Apple Security).