CVE-2025-43274 is a vulnerability identified in Apple macOS that allows a sandboxed process to bypass sandbox restrictions, potentially compromising the security boundaries intended to isolate processes. The sandbox mechanism in macOS is designed to restrict the capabilities of applications, limiting their access to system resources and user data to enhance security and privacy. This vulnerability arises from a flaw in the sandbox implementation, specifically related to code that was vulnerable and subsequently removed in macOS Sequoia 15.6. The flaw could allow a process running within a sandbox to escape these restrictions, thereby gaining unauthorized access to resources or data beyond its intended scope. The CVSS v3.1 base score is 4.4, reflecting a medium severity level. The vector indicates that exploitation requires local access (AV:L), low attack complexity (AC:L), low privileges (PR:L), no user interaction (UI:N), unchanged scope (S:U), limited confidentiality impact (C:L), no integrity impact (I:N), and limited availability impact (A:L). No known exploits have been reported in the wild, and the issue was addressed by removing the vulnerable code in the latest macOS update. The vulnerability is categorized under CWE-311, which relates to improper protection of sensitive information. This suggests that the sandbox bypass could lead to privacy issues by exposing data or system components that should remain isolated. The vulnerability affects all versions prior to macOS Sequoia 15.6, and users are advised to update to this version to mitigate the risk.

The primary impact of CVE-2025-43274 is the potential circumvention of sandbox restrictions, which undermines the security model of macOS that relies on sandboxing to isolate applications and processes. This can lead to unauthorized access to sensitive data or system resources that should be protected by sandbox boundaries. Although the confidentiality impact is limited, attackers could leverage this vulnerability to escalate privileges or move laterally within a compromised system. The availability impact is also limited but could manifest if the sandbox escape leads to denial-of-service conditions. Since exploitation requires local access with low privileges and no user interaction, the threat is more relevant in scenarios where an attacker already has some foothold on the system, such as through a compromised user account or malicious software running with limited rights. Organizations relying heavily on macOS for sensitive operations, especially those enforcing strict sandbox policies for security, may face increased risk of data leakage or system compromise if this vulnerability is not addressed. The absence of known exploits in the wild reduces immediate risk but does not eliminate the potential for future attacks.

To mitigate CVE-2025-43274, organizations and users should promptly update all affected macOS systems to version Sequoia 15.6 or later, where the vulnerable code has been removed. Beyond patching, administrators should enforce strict access controls to limit local user privileges and reduce the likelihood of untrusted code running within sandboxed environments. Employing endpoint detection and response (EDR) solutions can help identify suspicious local activities that attempt to exploit sandbox escapes. Regularly auditing sandbox policies and configurations can ensure that they are correctly applied and not weakened by misconfigurations. For environments with high security requirements, consider implementing additional layers of isolation such as virtualization or containerization to complement macOS sandboxing. Monitoring for unusual process behaviors and employing application whitelisting can further reduce the attack surface. Finally, educating users about the risks of running untrusted software locally can help prevent initial compromise scenarios that might lead to exploitation of this vulnerability.