CVE-2025-43432 is a use-after-free vulnerability identified in Apple Safari, disclosed in November 2025. The vulnerability stems from improper memory management when Safari processes specially crafted web content, leading to a use-after-free condition (CWE-416). This flaw can cause the Safari process to crash unexpectedly, resulting in denial of service for the user. The vulnerability affects multiple Apple platforms, including Safari 26.1, iOS 26.1, iPadOS 26.1, macOS Tahoe 26.1, tvOS 26.1, visionOS 26.1, and watchOS 26.1. The issue requires no privileges and no authentication but does require user interaction, such as visiting a maliciously crafted webpage. The CVSS v3.1 base score is 4.3 (medium severity), reflecting network attack vector, low complexity, no privileges required, user interaction required, unchanged scope, no impact on confidentiality or integrity, and low impact on availability (process crash). No known exploits have been reported in the wild, and Apple has addressed the vulnerability through improved memory management in the specified software versions. The vulnerability does not allow code execution or data leakage but can disrupt user experience and potentially impact availability of Safari-based services.

The primary impact of CVE-2025-43432 is denial of service due to unexpected Safari process crashes when processing malicious web content. For organizations, this can lead to reduced productivity, user frustration, and potential disruption of web-based workflows reliant on Safari. While the vulnerability does not compromise confidentiality or integrity, repeated crashes could be leveraged in targeted denial-of-service campaigns against users or services heavily dependent on Safari. In environments where Safari is the default or mandated browser, such as certain enterprise or government settings, this could affect operational continuity. Additionally, the vulnerability affects a broad range of Apple platforms, increasing the scope of potential impact across desktops, mobile devices, smart TVs, and emerging platforms like visionOS. Although no exploits are currently known, the ease of triggering the crash via crafted web content and the widespread use of Safari make timely patching critical to prevent potential abuse.

To mitigate CVE-2025-43432, organizations and users should promptly update Safari and all affected Apple operating systems to version 26.1 or later, where the vulnerability is fixed. Network administrators can implement web filtering to block access to suspicious or untrusted websites that might host malicious content designed to trigger the vulnerability. Employing endpoint protection solutions that monitor for abnormal application crashes can help detect exploitation attempts. For high-security environments, consider restricting Safari usage or deploying alternative browsers until patches are applied. Educate users about the risks of visiting untrusted websites and encourage cautious browsing behavior. Regularly review and update patch management processes to ensure timely deployment of security updates across all Apple devices. Finally, monitor vendor advisories and threat intelligence feeds for any emerging exploit activity related to this vulnerability.