CVE-2026-43765 in macOS
Summary
by MITRE • 07/28/2026
This issue was addressed with improved handling of symlinks. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to modify protected parts of the file system.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a critical privilege escalation flaw that emerged from inadequate symlink handling within Apple's operating systems. The issue stems from improper validation of symbolic link references during file system operations, allowing malicious applications to bypass normal access controls and modify protected system components. Such vulnerabilities typically arise when system components fail to properly resolve or validate symlink targets before performing write operations, creating pathways for unauthorized modifications to critical system files and directories.
The technical implementation of this flaw involves the failure of the operating system's security mechanisms to properly sanitize symlink paths during file system transactions. When applications attempt to create or modify files through symbolic links, the system should verify that the target path resolves to an acceptable location within the intended scope. However, this validation process was insufficient, enabling attackers to craft malicious symlink chains that could redirect operations to protected system areas. This type of vulnerability aligns with CWE-59, which describes improper handling of symbolic links, and represents a classic example of a path traversal or symlink attack vector.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and persistent access. An app that successfully exploits this flaw could modify critical system files, install malicious components in protected directories, or alter security settings that govern file system access controls. This capability allows for the establishment of persistent backdoors, modification of system integrity checks, and potentially complete system takeover. The vulnerability affects multiple macOS releases including Sequoia 15.7.8, Sonoma 14.8.8, and Tahoe 26.6, indicating it was present across a significant portion of Apple's operating system ecosystem. Attackers could leverage this issue to gain root privileges and execute arbitrary code with system-level permissions.
The mitigation strategy implemented by Apple focuses on enhanced symlink validation procedures that properly resolve and verify all symbolic link targets before allowing file system modifications. This approach aligns with the principle of least privilege and defensive programming practices recommended in the ATT&CK framework under techniques related to privilege escalation and defense evasion. Security administrators should ensure immediate deployment of the patched versions across all affected systems, while monitoring for suspicious file system activity that might indicate exploitation attempts. The fix demonstrates Apple's commitment to addressing security vulnerabilities through proper input validation and access control enforcement, reinforcing the importance of robust symlink handling in operating system security architectures.
Organizations should implement comprehensive monitoring solutions that track file system modifications, particularly in protected directories, as part of their overall threat detection strategy. The vulnerability highlights the importance of maintaining current system patches and implementing layered security controls to prevent exploitation attempts. Security teams must also consider the broader implications of symlink-based attacks within their environments and ensure that all applications properly validate file paths before performing operations that could affect system integrity. This incident serves as a reminder of the critical nature of proper path validation in preventing privilege escalation attacks and maintaining system security boundaries.