Use-after-free in WebKitGTK+ and WPE WebKit - CVE-2026-64718

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Main Vulnerability Database Vulnerabilities #VU143697

Use-after-free in WebKitGTK+ and WPE WebKit - CVE-2026-64718

Published: August 17, 2026 / Updated: August 17, 2026


Vulnerability identifier: #VU143697
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-2026-64718
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 Canvas 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
tvOS
macOS
iPadOS
Apple iOS
watchOS
Apple Safari
Virtualization Engine TS7700 3957-VED
IBM Virtualization Engine TS7700 3948-VED
System Storage Virtualization Engine TS7700 3948-VEF

How to mitigate CVE-2026-64718

Install security update from vendor's website.

visionOS - addressed in versions 26.6, 27.0
tvOS - update to 26.6 23L773
macOS - addressed in versions 26.6 25G72, 27.0 26A428
Apple Safari - addressed in versions 26.6, 27.0
iPadOS - addressed in versions 26.6 23G71, 26.7 23H24, 27.0 24A437
Apple iOS - addressed in versions 26.6 23G71, 26.7 23H24, 27.0 24A427, 27.0 24A437
watchOS - update to 26.6 23U67
Virtualization Engine TS7700 3957-VED - addressed in versions 8.60.0.115 VTD_EXEC.905, 8.60.0.116 VTD_EXEC.905, 8.61.0.60 VTD_EXEC.906
IBM Virtualization Engine TS7700 3948-VED - addressed in versions 8.60.0.115 VTD_EXEC.905, 8.60.0.116 VTD_EXEC.905, 8.61.0.60 VTD_EXEC.906
System Storage Virtualization Engine TS7700 3948-VEF - addressed in versions 8.60.0.115 VTD_EXEC.905, 8.60.0.116 VTD_EXEC.905, 8.61.0.60 VTD_EXEC.906

External References

Related Security Bulletins