Memory corruption in macOS - CVE-2026-20621

Vulnerability identifier: #VU122703

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-2026-20621

CWE-ID: CWE-119

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 boundary error in Wi-Fi. A local application can cause unexpected system termination or corrupt kernel memory.

macOS
visionOS
iPadOS
Apple iOS

Install update from vendor's website.

macOS - addressed in versions 26.3 25D125, 14.8.4 23J319, 15.7.4 24G517
visionOS - update to 26.3
iPadOS - addressed in versions 18.7.5 22H311, 26.3 23D127
Apple iOS - addressed in versions 18.7.5 22H311, 26.3 23D127

• https://support.apple.com/en-us/126348

• Multiple vulnerabilities in Apple macOS Tahoe
• Multiple vulnerabilities in macOS Sequoia
• Multiple vulnerabilities in Apple macOS Sonoma
• Multiple vulnerabilities in Apple visionOS
• Multiple vulnerabilities in Apple iOS 26 and iPadOS 26
• Multiple vulnerabilities in Apple iOS 18 and iPadOS 18