CVE-2025-43340
📋 TL;DR
This macOS vulnerability allows malicious applications to escape their sandbox restrictions, potentially accessing system resources or other applications' data. It affects macOS systems running versions before Tahoe 26. Users who install untrusted applications are at risk.
💻 Affected Systems
- macOS
📦 What is this software?
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 →⚠️ Risk & Real-World Impact
Worst Case
A malicious app could gain full system access, install persistent malware, steal sensitive data from other applications, or compromise the entire operating system.
Likely Case
Malicious apps could access files and resources outside their intended sandbox, potentially stealing user data or performing unauthorized actions.
If Mitigated
With proper app vetting and security controls, the risk is limited to potential data leakage from sandboxed apps rather than full system compromise.
🎯 Exploit Status
Exploitation requires user interaction to install and run a malicious application. The vulnerability is in the sandbox escape mechanism.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Tahoe 26
Vendor Advisory: https://support.apple.com/en-us/125110
Restart Required: Yes
Instructions:
1. Open System Settings 2. Click General 3. Click Software Update 4. Install macOS Tahoe 26 update 5. Restart when prompted
🔧 Temporary Workarounds
Restrict App Installation
allOnly allow installation of apps from the App Store and identified developers
sudo spctl --master-enable
sudo spctl --enable --label "Mac App Store"
sudo spctl --enable --label "Developer ID"
Disable Automatic App Opening
allPrevent automatically opening files from unknown developers
defaults write com.apple.LaunchServices LSQuarantine -bool true
🧯 If You Can't Patch
- Implement application allowlisting to only permit trusted applications
- Use endpoint detection and response (EDR) tools to monitor for sandbox escape attempts
🔍 How to Verify
Check if Vulnerable:
Check macOS version in System Settings > General > About. If version is earlier than Tahoe 26, the system is vulnerable.Check Version:
sw_versVerify Fix Applied:
Verify macOS version shows Tahoe 26 or later in System Settings > General > About.📡 Detection & Monitoring
Log Indicators:
- Unusual process spawning from sandboxed applications
- File access violations in sandbox logs
- Unexpected network connections from sandboxed apps
Network Indicators:
- Unexpected outbound connections from applications that shouldn't have network access
SIEM Query:
source="macos_sandbox" AND (event_type="violation" OR event_type="escape_attempt")