WebKitGTK Use-After-Free Flaw Can Crash Browsers on Apple and Red Hat Systems

Apple and Red Hat disclosed CVE-2026-43727, a use-after-free vulnerability in WebKit and WebKitGTK that can be triggered by maliciously crafted web content and cause an unexpected browser or process crash. The flaw is attributed to improper memory management and is tracked as CWE-416; Red Hat scored it CVSS 6.5 and classified it as moderate severity, with impact focused on availability rather than confirmed code execution.

Apple said the issue was fixed in Safari 26.5.2, iOS 18.7.10 and 26.5.2, iPadOS 18.7.10 and 26.5.2, macOS Tahoe 26.5.2, visionOS 26.6, and watchOS 26.6. Red Hat published fixes through multiple security errata for affected Red Hat Enterprise Linux 7, 8, and 9 offerings, while noting that Red Hat Enterprise Linux 6 packages are outside support scope and should be assumed affected if WebKitGTK is present.