CVE-2025-43430 is a vulnerability identified in Apple Safari and related Apple operating systems that arises from improper state management when processing specially crafted web content. This flaw can cause the Safari process to crash unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is classified under CWE-20 (Improper Input Validation) and CWE-703 (Improper Check or Handling of Exceptional Conditions), indicating that Safari does not correctly handle certain malformed inputs leading to unstable states. The issue affects multiple Apple platforms including Safari 26.1, iOS 26.1, macOS Tahoe 26.1, tvOS 26.1, watchOS 26.1, iPadOS 26.1, and visionOS 26.1. Exploitation requires no privileges (AV:N), has low attack complexity (AC:L), does not require authentication (PR:N), but does require user interaction (UI:R) such as visiting a malicious website. The scope is unchanged (S:U), and the impact is limited to availability (A:L) with no confidentiality or integrity impact. The CVSS v3.1 base score is 4.3, indicating medium severity. No known exploits have been reported in the wild, and Apple has addressed the vulnerability through improved state management in the specified versions. The vulnerability primarily poses a risk of denial of service by crashing the Safari process, potentially disrupting user activities or automated workflows relying on Safari rendering.

For European organizations, this vulnerability could lead to denial of service conditions on Apple devices running vulnerable versions of Safari and related OSes. This may disrupt business operations, especially for organizations relying on Safari for web-based applications or internal portals. Although the vulnerability does not compromise confidentiality or integrity, repeated crashes could degrade user productivity and cause operational interruptions. Sectors such as finance, healthcare, and government that rely heavily on Apple ecosystems may face increased risk of service disruption. Additionally, organizations with remote or hybrid workforces using Apple devices could experience reduced availability of critical web resources. While no known exploits exist currently, the ease of triggering the crash via crafted web content means attackers could weaponize this vulnerability for targeted denial of service attacks. The impact is more pronounced in environments where Safari is the default or mandated browser, or where automated systems depend on Safari rendering.

European organizations should prioritize updating all Apple devices to Safari 26.1 and the corresponding OS versions (iOS 26.1, macOS Tahoe 26.1, tvOS 26.1, watchOS 26.1, iPadOS 26.1, visionOS 26.1) as soon as possible. Network administrators should consider implementing web filtering to block access to suspicious or untrusted websites that could host malicious content exploiting this vulnerability. Security teams should monitor for unusual Safari crashes and investigate potential causes promptly. Employ endpoint detection and response (EDR) tools to detect abnormal process terminations and correlate with web activity. User awareness training should emphasize caution when clicking unknown or untrusted links, especially on Safari browsers. For critical environments, consider deploying alternative browsers temporarily until patches are applied. Regular vulnerability scanning and asset inventory should ensure no devices remain unpatched. Finally, maintain up-to-date backups and incident response plans to mitigate potential operational disruptions.