CVE-2026-43804 in Safari
Summary
by MITRE • 07/28/2026
This issue was addressed through improved state management. This issue is fixed in Safari 26.6, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6. Visiting a website may lead to an app denial-of-service.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a denial-of-service condition that could be triggered through web-based interactions within Apple's Safari browser and related operating systems. The issue stemmed from inadequate state management mechanisms that failed to properly handle certain web page conditions or user interactions, leading to application instability and potential crashes. The vulnerability was specifically addressed in Apple's software updates for Safari version 26.6, iOS 26.6, iPadOS 26.6, macOS Tahoe 26.6, and visionOS 26.6, indicating a comprehensive fix across the company's ecosystem.
The technical flaw involved improper handling of application state during web navigation or content rendering processes, which could cause the browser to enter an inconsistent state that ultimately resulted in application termination or unresponsiveness. This type of vulnerability falls under the broader category of software reliability issues and can be classified as a weakness in state management practices according to CWE standards. The flaw likely occurred when the application failed to properly transition between different operational states during web page processing, leading to memory corruption or resource exhaustion scenarios.
From an operational perspective, this vulnerability posed significant risks to end users who could encounter unexpected application crashes or unresponsiveness while browsing the web. The attack vector was particularly concerning as it only required visiting a malicious or compromised website, making it a passive threat that could affect users without their knowledge or explicit interaction beyond normal web browsing activities. This vulnerability could potentially be exploited by attackers to disrupt user productivity and create persistent availability issues for critical browser functionality.
The mitigation strategy implemented by Apple focused on improving the state management infrastructure within Safari and the underlying operating systems, ensuring proper handling of edge cases during web page rendering and navigation processes. This approach aligns with established security practices that emphasize robust error handling and state validation mechanisms. The fix demonstrates adherence to security best practices as outlined in various threat modeling frameworks and represents a typical response to state-related vulnerabilities that could lead to denial-of-service conditions, ensuring that applications maintain stable operation even when encountering unexpected or malformed input data.
Organizations should prioritize updating their systems to the patched versions mentioned above to protect against potential exploitation of this vulnerability. The remediation process involves straightforward software updates that address the root cause without requiring additional configuration changes or complex workaround implementations. This vulnerability serves as an example of how seemingly minor state management issues can have significant operational impacts on user experience and application reliability, highlighting the importance of comprehensive testing and validation of application states in security-critical software components. The fix demonstrates Apple's commitment to maintaining robust security posture across their ecosystem while addressing vulnerabilities that could impact user productivity and system availability.