CVE-2025-43440 in Safari
Summary
by MITRE • 11/04/2025
This issue was addressed with improved checks This issue is fixed in tvOS 26.1, watchOS 26.1, macOS Tahoe 26.1, iOS 26.1 and iPadOS 26.1, Safari 26.1, visionOS 26.1. Processing maliciously crafted web content may lead to an unexpected process crash.
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Analysis
by VulDB Data Team • 08/05/2026
This vulnerability represents a process stability issue that affects multiple Apple operating systems including tvOS, watchOS, macOS, iOS, iPadOS, Safari, and visionOS. The flaw manifests when the affected systems encounter maliciously crafted web content, leading to unexpected process crashes that could potentially disrupt normal system operations. The vulnerability was addressed through enhanced validation mechanisms and improved input checking procedures that prevent the malformed content from triggering the unstable behavior.
The technical nature of this vulnerability falls under the category of improper input validation, which is commonly associated with CWE-20 - Improper Input Validation. The issue specifically affects how the affected systems process and handle web content that contains crafted elements designed to exploit weaknesses in the parsing or rendering mechanisms. When such malicious content is encountered, the system's normal execution flow becomes disrupted, resulting in process termination or crash events that could impact user experience and system stability.
From an operational perspective, this vulnerability presents a moderate risk to affected systems as it could be exploited through web-based attacks. An attacker could potentially craft web pages or content that when loaded in Safari or other affected applications would cause the processes to crash. This could lead to denial of service conditions where legitimate users experience disruptions to their browsing sessions or application functionality. The impact extends beyond simple crashes as it could potentially provide a foothold for more sophisticated attacks if combined with other vulnerabilities or if the crashes occur in critical system processes.
The remediation implemented by Apple in versions 26.1 across all affected platforms addresses this issue through enhanced validation checks that properly sanitize and validate incoming web content before processing. These improvements align with security best practices outlined in the OWASP Top Ten and MITRE ATT&CK framework under the techniques related to input validation and process stability. The fix demonstrates Apple's proactive approach to addressing security concerns through regular updates and patches, ensuring that users running the latest versions maintain protection against such vulnerabilities. Organizations should prioritize deploying these updates across their fleets to mitigate potential risks associated with this process stability issue.