CVE-2026-20627
📋 TL;DR
This CVE describes an environment variable handling vulnerability in Apple operating systems that could allow malicious apps to access sensitive user data. The issue affects multiple Apple platforms including iOS, macOS, watchOS, and visionOS. Users running affected versions are vulnerable to potential data exposure.
💻 Affected Systems
- iOS
- iPadOS
- macOS
- watchOS
- visionOS
📦 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 →Watchos by Apple
⚠️ Risk & Real-World Impact
Worst Case
A malicious app could access sensitive user data including credentials, personal information, or system configuration data stored in environment variables.
Likely Case
Malicious apps could access limited sensitive data from environment variables, potentially leading to information disclosure or privilege escalation.
If Mitigated
With proper app sandboxing and security controls, the impact would be limited to data accessible within the app's sandbox.
🎯 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, visionOS 26.3, iOS 26.3, iPadOS 26.3
Vendor Advisory: https://support.apple.com/en-us/126346
Restart Required: No
Instructions:
1. Open Settings app 2. Navigate to General > Software Update 3. Download and install the latest available update 4. For macOS, use System Settings > General > Software Update
🔧 Temporary Workarounds
Restrict App Installation
allOnly install apps from trusted sources like the official App Store to reduce risk of malicious apps exploiting this vulnerability.
🧯 If You Can't Patch
- Implement strict app installation policies to prevent untrusted apps from being installed
- Use mobile device management (MDM) solutions to enforce security policies and monitor for suspicious app behavior
🔍 How to Verify
Check if Vulnerable:
Check current OS version in Settings > General > About (iOS/iPadOS) or System Settings > General > About (macOS)Check Version:
iOS/iPadOS: Settings > General > About > Version; macOS: System Settings > General > About > macOS version; Terminal: sw_versVerify Fix Applied:
Verify OS version matches or exceeds the patched versions listed in the fix information📡 Detection & Monitoring
Log Indicators:
- Unusual app behavior accessing environment variables
- App crashes related to environment variable handling
Network Indicators:
- No specific network indicators as this is a local vulnerability
SIEM Query:
No specific SIEM query available as this is an OS-level vulnerability requiring app-level monitoring