Use-after-free in WebKitGTK+ and WPE WebKit - CVE-2026-64783
Published: August 17, 2026 / Updated: August 17, 2026
Vulnerability identifier: #VU143693
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64783
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to use-after-free in WebKit when processing maliciously crafted web content. A remote attacker can send maliciously crafted web content to cause a denial of service.
User interaction is required to process the crafted web content.
Affected software
WebKitGTK+
WPE WebKit
visionOS
macOS
iPadOS
Apple iOS
watchOS
Apple Safari
WPE WebKit
visionOS
macOS
iPadOS
Apple iOS
watchOS
Apple Safari
How to mitigate CVE-2026-64783
Install security update from vendor's website.
visionOS - update to 26.6
macOS - update to 26.6 25G72
Apple Safari - update to 26.6
iPadOS - update to 26.6 23G71
Apple iOS - update to 26.6 23G71
watchOS - update to 26.6 23U67
macOS - update to 26.6 25G72
Apple Safari - update to 26.6
iPadOS - update to 26.6 23G71
Apple iOS - update to 26.6 23G71
watchOS - update to 26.6 23U67