CVE-2025-43326 is a vulnerability identified in Apple macOS that stems from an out-of-bounds read condition classified under CWE-125. This occurs when an application accesses memory outside the intended bounds, potentially exposing sensitive user data. The root cause is insufficient bounds checking in certain macOS components, which Apple has addressed in macOS Sequoia 15.7, Sonoma 14.8, and Tahoe 26 by enhancing the validation of memory accesses. The vulnerability allows an unprivileged attacker to craft a malicious app that, upon user interaction, can read sensitive data from memory regions it should not access. The CVSS v3.1 base score is 5.5, indicating a medium severity level, with the vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N. This means the attack requires local access and user interaction but no privileges, and it impacts confidentiality without affecting integrity or availability. No public exploits have been reported yet, but the potential for sensitive data leakage makes it a concern for privacy and data protection. The vulnerability affects multiple recent macOS versions, emphasizing the need for timely patching. The flaw does not allow code execution or system compromise but could expose personal or corporate sensitive information stored in memory, such as credentials, tokens, or private files.

The primary impact of CVE-2025-43326 is the unauthorized disclosure of sensitive user data on affected macOS systems. Organizations relying on macOS devices for handling confidential information, including enterprises, government agencies, and individuals, face risks of data leakage that could lead to privacy violations, intellectual property theft, or exposure of credentials. Since the vulnerability requires local access and user interaction, the attack surface is somewhat limited to scenarios where a user installs or runs a malicious app or file. However, the ease of exploitation without privileges means that even non-administrative users or attackers with limited access could exploit this flaw. The confidentiality breach could facilitate further attacks such as social engineering, identity theft, or lateral movement within networks. The lack of impact on integrity and availability reduces the risk of system disruption but does not diminish the importance of protecting sensitive data. Organizations with macOS endpoints should consider this vulnerability a moderate risk that warrants prompt remediation to prevent potential data breaches.

To mitigate CVE-2025-43326, organizations and users should immediately apply the security updates provided by Apple in macOS Sequoia 15.7, Sonoma 14.8, and Tahoe 26. Beyond patching, organizations should enforce strict application control policies to prevent installation or execution of untrusted or unsigned applications that could exploit this vulnerability. Employ endpoint protection solutions capable of detecting anomalous memory access patterns or suspicious app behavior. Educate users about the risks of running unknown or unverified applications and the importance of verifying software sources. Implement least privilege principles to limit local user capabilities and reduce the likelihood of malicious app installation. Regularly audit installed applications and monitor system logs for unusual activity indicative of exploitation attempts. For environments with high confidentiality requirements, consider additional data encryption and memory protection mechanisms to reduce the impact of potential data exposure. Finally, maintain an incident response plan to quickly address any suspected exploitation.