Out-of-bounds write in macOS - CVE-2026-20611

Vulnerability identifier: #VU122675

CSH Severity: High

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-20611

CWE-ID: CWE-787

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when decoding audio APAC frames. A remote attacker can create a specially crafted audio file, trick the victim into opening it using the affected software, trigger an out-of-bounds write and execute arbitrary code on the target system.

macOS
visionOS
watchOS
tvOS
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
watchOS - update to 26.3 23S620
tvOS - update to 26.3 23K620
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
• https://www.zerodayinitiative.com/advisories/ZDI-26-173/

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