CVE-2025-43531 in iOS
Summary
by MITRE • 12/17/2025
A race condition was addressed with improved state handling. This issue is fixed in watchOS 26.2, Safari 26.2, iOS 18.7.3 and iPadOS 18.7.3, iOS 26.2 and iPadOS 26.2, macOS Tahoe 26.2, visionOS 26.2, tvOS 26.2. Processing maliciously crafted web content may lead to an unexpected process crash.
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Analysis
by VulDB Data Team • 01/24/2026
This vulnerability represents a race condition flaw that emerged in Apple's operating systems and web browsers, specifically affecting versions prior to the mentioned security updates. The issue stems from inadequate state handling mechanisms during concurrent processing operations, creating opportunities for malicious actors to exploit temporal inconsistencies in system behavior. The vulnerability affects multiple Apple platforms including watchOS, iOS, iPadOS, macOS, visionOS, and tvOS, indicating a systemic architectural weakness that requires comprehensive remediation across the entire Apple ecosystem. The race condition occurs when multiple processes or threads attempt to access shared resources simultaneously, leading to unpredictable system states and potential security implications.
The technical exploitation of this vulnerability involves crafting malicious web content that triggers the race condition during normal browser or operating system operations. When processed, this content causes unexpected process crashes that could potentially be leveraged for more sophisticated attacks. The flaw falls under the category of timing-based vulnerabilities where the window of opportunity for exploitation exists during the brief moments when system states are transitioning between different operational modes. This type of vulnerability is particularly dangerous because it can lead to denial of service conditions or potentially provide attackers with opportunities to escalate privileges or execute arbitrary code. The issue is classified under CWE-362, which specifically addresses race conditions in software development where concurrent execution of processes creates security vulnerabilities.
The operational impact of this vulnerability extends beyond simple process crashes, as it represents a fundamental weakness in Apple's concurrent processing architecture. Attackers could potentially use this flaw to disrupt services, cause system instability, or create conditions that enable more serious exploitation techniques. The vulnerability affects all affected platforms, making it a significant concern for organizations that rely on Apple devices for business operations, as it could lead to widespread service disruption. The timing of the exploitation is crucial, as the race condition must be triggered during specific system operations when state transitions occur. This makes the vulnerability particularly challenging to detect and prevent through traditional security measures.
The remediation strategy involves implementing improved state handling mechanisms that prevent concurrent access to critical system resources during state transitions. Apple's security updates address this issue by strengthening synchronization protocols and ensuring proper resource management during concurrent operations. Organizations should prioritize immediate deployment of the security patches across all affected Apple platforms, as the vulnerability could be actively exploited in the wild. The fix demonstrates Apple's commitment to addressing race condition vulnerabilities through improved architectural design and enhanced system stability measures. Security teams should monitor for any signs of exploitation attempts and implement additional network monitoring to detect potential malicious web content targeting this vulnerability. The solution aligns with industry best practices for preventing race condition exploits and maintaining system integrity during concurrent processing operations.