CVE-2026-20667
📋 TL;DR
This CVE describes a sandbox escape vulnerability in Apple operating systems where a malicious app could bypass security restrictions designed to isolate it from other apps and system resources. All users running affected Apple operating systems are vulnerable until patched.
💻 Affected Systems
- watchOS
- macOS
- iOS
- iPadOS
📦 What is this software?
Ipados by Apple
Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Watchos by Apple
⚠️ Risk & Real-World Impact
Worst Case
A malicious app could gain elevated privileges, access sensitive user data from other apps, modify system files, or install persistent malware.
Likely Case
Malicious apps could access data from other installed applications, potentially stealing credentials, personal information, or financial data.
If Mitigated
With proper app vetting through official app stores and user caution about app sources, risk is significantly reduced but not eliminated.
🎯 Exploit Status
Exploitation requires a malicious app to be installed and executed on the target device. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: watchOS 26.3, macOS Tahoe 26.3, macOS Sonoma 14.8.4, macOS Sequoia 15.7.4, iOS 26.3, iPadOS 26.3
Vendor Advisory: https://support.apple.com/en-us/126346
Restart Required: No
Instructions:
1. Open Settings/System Preferences 2. Navigate to Software Update 3. Download and install the latest available update 4. Verify installation completed successfully
🔧 Temporary Workarounds
Restrict App Installation Sources
allOnly install apps from official Apple App Store to reduce risk of malicious apps
🧯 If You Can't Patch
- Implement strict application allowlisting policies
- Monitor for unusual app behavior and system modifications
🔍 How to Verify
Check if Vulnerable:
Check current OS version against affected versions listCheck Version:
On macOS: sw_vers -productVersion; On iOS/iPadOS: Settings > General > About > Version; On watchOS: Watch app > General > About > VersionVerify Fix Applied:
Verify OS version matches or exceeds patched versions listed in fix_official.patch_version📡 Detection & Monitoring
Log Indicators:
- Unusual app behavior logs
- Sandbox violation logs
- Unexpected privilege escalation attempts
Network Indicators:
- Unusual outbound connections from apps
- Unexpected network activity patterns
SIEM Query:
Search for process creation events with unexpected parent-child relationships or privilege escalation patterns