CVE-2025-43295: 
macOS vulnerability analysis and mitigation

A denial-of-service vulnerability (CVE-2025-43295) was discovered in Apple's operating systems, affecting macOS Sequoia 15.7, macOS Sonoma 14.8, macOS Tahoe 26, iOS 18.7, and iPadOS 18.7. The vulnerability was discovered by security researcher Nathaniel Oh (@calysteon) and was officially disclosed on September 15, 2025. The issue resides in the libc component of these operating systems, where improper validation could allow a malicious application to cause a denial-of-service condition (Apple Support).

The vulnerability is classified as a denial-of-service issue that was addressed with improved validation mechanisms. According to the CVSS 3.1 scoring by CISA-ADP, the vulnerability has a base score of 5.5 (Medium) with the following vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. The vulnerability is associated with CWE-400 (Uncontrolled Resource Consumption) (NVD).

When exploited, this vulnerability allows a malicious application to cause a denial-of-service condition on the affected system. The impact is limited to availability, with no direct impact on confidentiality or integrity of the system (Apple Support, NVD).

Apple has addressed this vulnerability by implementing improved validation in the affected systems. Users are advised to update to macOS Sequoia 15.7, macOS Sonoma 14.8, macOS Tahoe 26, iOS 18.7, or iPadOS 18.7, depending on their device (Apple Support).