CVE-2025-43412 is a vulnerability in Apple macOS related to the file quarantine mechanism, which is designed to restrict potentially unsafe files downloaded from the internet. The issue stems from insufficient validation checks that allowed an application to bypass these quarantine restrictions and break out of its sandbox environment. Sandboxing is a critical security feature in macOS that isolates applications to limit their access to system resources and user data, thereby containing potential damage from malicious or compromised apps. The vulnerability was addressed by Apple through additional validation checks in macOS Sequoia 15.7.2, Sonoma 14.8.2, and Tahoe 26.1. The CVSS v3.1 score of 6.3 reflects a medium severity, with an attack vector requiring local access (AV:L), low attack complexity (AC:L), and low privileges (PR:L), but no user interaction (UI:N). The scope is changed (S:C), indicating that exploitation can affect resources beyond the vulnerable component. The impact includes partial loss of confidentiality, integrity, and availability (C:L/I:L/A:L). The vulnerability is classified under CWE-284 (Improper Access Control), highlighting that the sandbox escape results from inadequate enforcement of access restrictions. No public exploits or active exploitation in the wild have been reported to date, but the potential for privilege escalation and unauthorized access makes this a significant concern for macOS users and administrators.

If exploited, this vulnerability allows a malicious or compromised application to escape the macOS sandbox, potentially gaining unauthorized access to system resources and user data beyond its intended scope. This can lead to partial compromise of confidentiality, integrity, and availability of the affected system. Attackers with local access and low privileges could leverage this flaw to escalate privileges, execute arbitrary code with higher permissions, or bypass security controls, increasing the risk of persistent compromise or data leakage. For organizations, this could mean exposure of sensitive information, disruption of critical services, or foothold establishment for further attacks. Although exploitation requires local access and no user interaction, environments with multiple users or where untrusted applications can be installed are particularly at risk. The absence of known exploits in the wild reduces immediate threat but does not eliminate the risk, especially as threat actors may develop exploits once the vulnerability details become widely known. The impact is significant in enterprise, government, and high-security environments relying on macOS for secure operations.

Organizations and users should promptly update affected macOS versions to Sequoia 15.7.2, Sonoma 14.8.2, or Tahoe 26.1 where the vulnerability is patched. Beyond patching, restrict local user privileges to the minimum necessary to reduce the risk of exploitation. Employ application whitelisting and restrict installation of untrusted or unsigned applications to limit exposure to potentially malicious apps attempting sandbox escape. Monitor system logs and behavior for unusual activity indicative of sandbox escape attempts or privilege escalation. Use endpoint detection and response (EDR) tools capable of detecting anomalous process behavior related to sandbox breakout. Regularly audit and enforce strict access controls and sandbox policies. For environments with sensitive data, consider additional layers of defense such as network segmentation and multi-factor authentication to limit lateral movement if compromise occurs. Stay informed on any emerging exploit reports or additional patches from Apple.