Use after free in macOS - CVE-2026-43717

Vulnerability identifier: #VU137115

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-2026-43717

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error in WebRTC. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected Safari crash.

macOS
tvOS
iPadOS
Apple iOS
watchOS
Apple Safari

Install update from vendor's website.

macOS - update to 26.5.2 25F84
tvOS - update to 26.6 23L773
iPadOS - addressed in versions 18.7.10 22H374, 26.5.2 23F84
Apple iOS - addressed in versions 18.7.10 22H374, 26.5.2 23F84
Apple Safari - update to 26.5.2
watchOS - update to 26.6 23U67

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

• Multiple vulnerabilities in Apple macOS Tahoe
• Multiple vulnerabilities in Apple tvOS
• Multiple vulnerabilities in Apple watchOS
• Multiple vulnerabilities in iOS 26 and iPadOS 26
• Multiple vulnerabilities in Apple Safari
• Multiple vulnerabilities in iOS 18 and iPadOS 18