CVE-2026-20615: Apple Path Handling Privilege Escalation

CVE-2026-20615 Overview

A path handling vulnerability exists in multiple Apple operating systems due to improper validation of file paths. This flaw allows a malicious application to bypass security restrictions and gain root privileges on affected devices, potentially compromising the entire system.

Critical Impact

Exploitation of this vulnerability allows an attacker with local access to escalate privileges to root, gaining complete control over the affected device.

Affected Products

• iOS 26.3 and iPadOS 26.3
• macOS Tahoe 26.3
• macOS Sonoma 14.8.4
• visionOS 26.3

Discovery Timeline

• 2026-02-11 - CVE-2026-20615 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2026-20615

Vulnerability Analysis

This vulnerability stems from insufficient validation of file path inputs within Apple's operating systems. When an application provides a maliciously crafted path, the system fails to properly sanitize or validate the input, allowing the application to access or manipulate resources outside its intended scope. This path handling flaw can be leveraged to achieve privilege escalation, ultimately granting the attacking application root-level access to the system.

The vulnerability affects the path resolution mechanism in Apple's file system handling layer. By exploiting improper path normalization, an attacker can construct paths that escape their intended directory context and interact with privileged system resources.

Root Cause

The root cause of CVE-2026-20615 is improper input validation in the path handling routines. The affected components fail to adequately normalize and validate file paths before processing them, allowing path traversal techniques to bypass security boundaries. This validation gap permits applications to reference files and directories outside their authorized scope, ultimately enabling privilege escalation to root.

Attack Vector

The attack requires local access through a malicious application installed on the target device. The attacker must craft an application that exploits the path handling flaw by providing specially constructed file paths. When the vulnerable system processes these paths without proper validation, the application can manipulate privileged resources, leading to root access.

The exploitation flow involves:

1. Installing a malicious application on the target device
2. The application generates crafted path inputs that exploit the validation weakness
3. The system processes these paths, inadvertently granting access to privileged resources
4. The attacker achieves root privileges on the device

For technical details on the vulnerability mechanism, refer to Apple Security Advisory #126346 and related advisories.

Detection Methods for CVE-2026-20615

Indicators of Compromise

• Unexpected privilege changes for applications or processes
• Applications accessing system directories outside their sandbox
• Unusual file system activity involving path traversal patterns
• Processes running with elevated privileges that shouldn't have root access

Detection Strategies

• Monitor for applications attempting to access paths outside their designated containers
• Implement file integrity monitoring on critical system directories
• Track process privilege changes, especially unexpected escalations to root
• Audit application behavior for suspicious path manipulation patterns

Monitoring Recommendations

• Enable comprehensive logging for file system access events
• Deploy endpoint detection and response (EDR) solutions to monitor for privilege escalation attempts
• Implement alerts for unauthorized modifications to protected system resources
• Review installed applications for unauthorized or suspicious software

How to Mitigate CVE-2026-20615

Immediate Actions Required

• Update affected Apple devices to the latest patched versions immediately
• Review installed applications and remove any untrusted or suspicious software
• Restrict installation of applications to trusted sources (App Store only)
• Enable all available security features on affected devices

Patch Information

Apple has released security updates addressing this vulnerability. Users should update to the following patched versions:

• iOS/iPadOS: Update to iOS 26.3 or later
• macOS Tahoe: Update to macOS Tahoe 26.3 or later
• macOS Sonoma: Update to version 14.8.4 or later
• visionOS: Update to visionOS 26.3 or later

For detailed patch information, consult the official Apple Security Advisories:

• Apple Security Advisory #126346
• Apple Security Advisory #126348
• Apple Security Advisory #126350
• Apple Security Advisory #126353

Workarounds

• Limit application installation to verified App Store applications only
• Remove or disable untrusted applications until patching is complete
• Implement Mobile Device Management (MDM) policies to control application installation
• Regularly audit installed applications and system integrity

# Check current macOS version
sw_vers

# Update macOS via command line
softwareupdate --install --all