CVE-2025-31277: 
Apple Safari vulnerability analysis and mitigation

CVE-2025-31277 is a memory corruption vulnerability affecting multiple Apple operating systems and Safari browser. The vulnerability was discovered by researchers Yuhao Hu, Yan Kang, Chenggang Wu, and Xiaojie Wei, and was disclosed on July 29, 2025. The affected systems include Safari 18.6, watchOS 11.6, visionOS 2.6, iOS 18.6 and iPadOS 18.6, macOS Sequoia 15.6, and tvOS 18.6 (Apple Security).

The vulnerability exists in WebKit, Apple's browser engine, where processing maliciously crafted web content may lead to memory corruption. The issue was addressed with improved memory handling in WebKit Bugzilla: 291745. The vulnerability has received a CVSS 3.1 Base Score of 8.8 HIGH with vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating it is a critical security issue (NVD).

When exploited, this vulnerability could allow processing of maliciously crafted web content to lead to memory corruption, potentially enabling an attacker to execute arbitrary code or cause system crashes. The high CVSS score indicates potential impacts on confidentiality, integrity, and availability of the affected systems (Apple Security).

Apple has addressed this vulnerability by implementing improved memory handling in the affected systems. Users are advised to update to Safari 18.6, watchOS 11.6, visionOS 2.6, iOS 18.6 and iPadOS 18.6, macOS Sequoia 15.6, or tvOS 18.6, depending on their device (Apple Security).