CVE-2025-43353: 
macOS vulnerability analysis and mitigation

CVE-2025-43353 is a security vulnerability discovered in Apple's macOS operating systems that was disclosed on September 15, 2025. The vulnerability affects multiple versions of macOS including Sequoia 15.7, Sonoma 14.8, and Tahoe 26. The issue involves processing maliciously crafted strings that could lead to heap corruption (Apple Support).

The vulnerability is classified as an out-of-bounds write issue (CWE-787) in the Libinfo component of macOS. It received a CVSS v3.1 base score of 5.5 (MEDIUM) with the vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H, indicating local access, low attack complexity, no privileges required, and user interaction required (NVD).

When exploited, this vulnerability can lead to heap corruption through the processing of maliciously crafted strings. The impact primarily affects system stability and could potentially result in system crashes or unexpected behavior (Apple Support).

Apple has addressed this vulnerability by implementing improved bounds checks in the affected systems. The fix has been released in macOS Sequoia 15.7, macOS Sonoma 14.8, and macOS Tahoe 26. Users are advised to update their systems to these versions to mitigate the vulnerability (Apple Support).