CVE-2025-43206 is a vulnerability identified in Apple macOS that arises from a parsing issue in the handling of directory paths. Specifically, the flaw involves improper validation of directory pathnames, classified under CWE-22, which can lead to an application bypassing intended access restrictions and gaining unauthorized access to protected user data. This vulnerability affects multiple macOS versions prior to the patched releases: macOS Sequoia 15.6, macOS Sonoma 14.7.7, and macOS Ventura 13.7.7. The root cause is insufficient sanitization and validation of directory paths, which may allow malicious or compromised applications to traverse directories and access files outside their permitted scope. The CVSS v3.1 base score is 4.0, indicating a medium severity level. The vector string (AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) shows that exploitation requires local access but no privileges or user interaction, and the impact is limited to confidentiality loss without affecting integrity or availability. No public exploits or active exploitation in the wild have been reported to date. Apple addressed this vulnerability by improving path validation mechanisms in the affected macOS versions. This vulnerability is significant because it could allow unauthorized data disclosure if a malicious app is installed or executed locally, potentially exposing sensitive user information.

The primary impact of CVE-2025-43206 is unauthorized disclosure of protected user data on affected macOS systems. Since the vulnerability allows an app to bypass directory path restrictions, sensitive files and user information could be accessed without proper authorization. This compromises confidentiality but does not affect data integrity or system availability. The requirement for local access limits the attack vector to scenarios where an attacker already has some foothold on the system, such as through social engineering, malicious app installation, or insider threat. Organizations relying heavily on macOS devices for sensitive operations, especially those in sectors like finance, healthcare, and government, could face data leakage risks. Although no known exploits exist currently, the vulnerability could be leveraged in targeted attacks or combined with other exploits to escalate data access. The medium severity rating reflects the moderate risk posed, balancing the limited attack surface with the potential sensitivity of exposed data.

To mitigate CVE-2025-43206, organizations should prioritize updating all affected macOS systems to the patched versions: Sequoia 15.6, Sonoma 14.7.7, or Ventura 13.7.7. Applying these updates ensures improved path validation and closes the vulnerability. Beyond patching, organizations should enforce strict application whitelisting and code signing policies to prevent unauthorized or untrusted applications from executing locally. Employ endpoint protection solutions capable of detecting anomalous file system access patterns that may indicate exploitation attempts. Regularly audit installed applications and remove any that are unnecessary or untrusted. Educate users on the risks of installing unverified software and the importance of maintaining updated systems. For environments with high security requirements, consider implementing macOS sandboxing and mandatory access controls to limit app permissions further. Monitoring local system logs for unusual directory traversal or file access events can provide early detection of exploitation attempts. Finally, maintain robust backup and data encryption practices to protect sensitive information in case of compromise.