CVE-2026-64766 in iOS
Summary
by MITRE • 07/28/2026
An integer overflow was addressed with improved input validation. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. Processing a maliciously crafted file may lead to unexpected app termination or arbitrary code execution.
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Analysis
by VulDB Data Team • 07/28/2026
An integer overflow vulnerability represents a critical class of software flaw that can be exploited to compromise system integrity and execute unauthorized code. This particular vulnerability stems from insufficient input validation mechanisms within Apple's operating systems, where the system fails to properly check the boundaries of integer values during file processing operations. The flaw allows malicious actors to craft specially designed files that trigger arithmetic overflow conditions when the system attempts to process these inputs, potentially leading to unpredictable behavior in the affected applications.
The technical implementation of this vulnerability involves scenarios where integer variables exceed their maximum representable values, causing wraparound behaviors that can be manipulated by attackers. When processing maliciously crafted files, the system's failure to validate input parameters creates opportunities for attackers to exploit the integer overflow condition to overwrite memory locations or manipulate control flow. This type of vulnerability falls under the common weakness enumeration CWE-190 which specifically addresses integer overflow conditions and their potential exploitation pathways.
The operational impact of this vulnerability extends across multiple Apple platforms including iOS, iPadOS, macOS variants, tvOS, visionOS, and watchOS, indicating a widespread exposure that affects both mobile and desktop computing environments. The consequences range from unexpected application termination to full arbitrary code execution capabilities, which represents a severe escalation from simple denial of service conditions to potential system compromise. Attackers can leverage this vulnerability to execute malicious payloads without user interaction, making it particularly dangerous in automated exploitation scenarios.
Security researchers have identified that the fix implemented by Apple addresses the root cause through enhanced input validation mechanisms that properly check integer boundaries before processing potentially malicious inputs. The remediation efforts align with established security practices that emphasize defensive programming techniques and proper boundary checking to prevent arithmetic overflow conditions. Organizations should prioritize immediate deployment of these updates across all affected platforms, as the vulnerability exists in multiple operating system versions simultaneously.
The exploitation potential of this vulnerability is particularly concerning given Apple's ecosystem integration, where successful exploitation could lead to unauthorized access to sensitive data, persistent backdoor installation, or privilege escalation attacks. The fix demonstrates Apple's commitment to addressing security weaknesses through proactive patch management and improved software validation processes. System administrators should monitor for affected versions and ensure comprehensive testing of updates before deployment to maintain operational continuity while addressing the identified security gap. This vulnerability highlights the ongoing importance of robust input validation practices in preventing integer overflow exploitation and maintaining overall system security posture across enterprise and consumer environments.