Out-of-bounds read in macOS - CVE-2026-20634
Published: February 11, 2026 / Updated: March 14, 2026
Vulnerability identifier: #VU122683
CSH Severity: Medium
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20634
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when parsing SGI images within the ImageIO framework. A remote attacker can create a specially crafted file, trick the victim into opening it, trigger an out-of-bounds read error and read contents of memory on the system.
Affected software
macOS
visionOS
watchOS
tvOS
iPadOS
Apple iOS
visionOS
watchOS
tvOS
iPadOS
Apple iOS
How to mitigate CVE-2026-20634
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
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
External References
Related Security Bulletins
- 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