Use after free in macOS - CVE-2026-20687

Vulnerability identifier: #VU124363

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-20687

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local application to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in Kernel. A local application can cause unexpected system termination or write kernel memory.

macOS
iPadOS
Apple iOS
tvOS
watchOS

Install update from vendor's website.

macOS - addressed in versions 26.4 25E246, 15.7.5 24G624
iPadOS - addressed in versions 18.7.7 22H333, 26.4 23E246
Apple iOS - addressed in versions 18.7.7 22H333, 26.4 23E246
tvOS - update to 26.4 23L243
watchOS - update to 26.4 23T240

• https://support.apple.com/en-us/126794

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