Executive brief
WebKit, the rendering engine used by Safari and other Apple applications, contains an integer overflow vulnerability in its image processing component. An attacker can exploit this by delivering maliciously crafted web content that triggers memory corruption, potentially allowing code execution or causing application crashes. This affects millions of users across Apple's ecosystem including Safari, iOS, iPadOS, and macOS devices.
Technical details
CVE-2026-65390 is an integer overflow vulnerability in WebKit's image processing routines. The vulnerability occurs when parsing maliciously crafted image data, where insufficient input validation allows integer overflow to occur, leading to heap buffer overflow and memory corruption. The attack requires the user to visit a malicious website or view crafted web content—no authentication is required. Successful exploitation can lead to arbitrary code execution with the privileges of the Safari process or other applications using WebKit. Apple addressed this issue with improved input validation in Safari 26.6.1, iOS 26.6.1, iPadOS 26.6.1, macOS Tahoe 26.6.2, tvOS 27, visionOS 27, and watchOS 27.
Affected products
- Apple Safari before 26.6.1
- Apple iOS before 26.6.1
- Apple iPadOS before 26.6.1
- Apple macOS Tahoe before 26.6.2
- Apple tvOS before 27
- Apple visionOS before 27
- Apple watchOS before 27
Timeline
- 2026-09-14: disclosed: CVE-2026-65390 disclosed and security advisory published
- 2026-08-17: patched: Patches released: Safari 26.6.1, iOS 26.6.1, iPadOS 26.6.1, macOS Tahoe 26.6.2, tvOS 27, visionOS 27, watchOS 27