Use-after-free in macOS - CVE-2026-43704

Vulnerability identifier: #VU137086

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-43704

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to use-after-free in web extensions when handling extension content. A remote attacker can trigger the vulnerable condition to cause a denial of service.

macOS
visionOS
tvOS
Apple iOS
iPadOS
watchOS
Apple Safari

Install update from vendor's website.

macOS - update to 26.5.2 25F84
visionOS - update to 26.6
tvOS - update to 26.6 23L773
Apple Safari - update to 26.5.2
Apple iOS - update to 26.5.2 23F84
iPadOS - update to 26.5.2 23F84
watchOS - update to 26.6 23U67

• https://support.apple.com/en-us/127595

• Multiple vulnerabilities in Apple macOS Tahoe
• Multiple vulnerabilities in Apple visionOS
• Multiple vulnerabilities in Apple tvOS
• Multiple vulnerabilities in Apple watchOS
• Multiple vulnerabilities in iOS 26 and iPadOS 26
• Multiple vulnerabilities in Apple Safari