CVE-2026-43769 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. An app may be able to cause unexpected system termination.
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Analysis
by VulDB Data Team • 07/28/2026
An integer overflow vulnerability represents a critical class of software flaw that occurs when a program attempts to store a value that exceeds the maximum capacity of an integer data type, leading to unexpected behavior and potential system instability. This particular vulnerability affects multiple Apple operating systems including iOS, iPadOS, macOS versions, tvOS, visionOS, and watchOS, with fixes released in versions 26.6 and their respective updated counterparts. The flaw stems from inadequate input validation mechanisms that fail to properly check integer boundaries before processing user-supplied or system-generated data values. When an application successfully exploits this vulnerability through crafted inputs, it can trigger unexpected system termination events that may result in complete application crashes or even full system instability.
The technical implementation of this vulnerability involves scenarios where applications process numerical inputs without proper boundary checks, allowing malicious actors to feed integer values that exceed the allocated storage capacity of the target data type. This overflow condition typically manifests when unsigned integers are used in loop counters, array indices, buffer sizes, or other arithmetic operations where the result exceeds the maximum representable value for that specific integer type. The vulnerability's classification aligns with common weakness enumeration CWE-190 which specifically addresses "Integer Overflow or Wraparound" conditions, and it also maps to attack techniques described in the mitre ATT&CK framework under software exploitation categories such as privilege escalation and denial of service attacks.
The operational impact of this vulnerability extends beyond simple application crashes to potentially enable more sophisticated attacks that could compromise system integrity and availability. When an integer overflow occurs during critical system operations, the resulting unexpected termination may provide attackers with opportunities to execute arbitrary code or manipulate system resources in unintended ways. The affected platforms span Apple's entire ecosystem, making this vulnerability particularly concerning as it affects both mobile and desktop computing environments with varying security postures and attack surface characteristics.
Organizations and users must prioritize immediate deployment of the patched versions mentioned in the advisory to mitigate this risk effectively. The recommended mitigation strategy involves ensuring all affected systems receive the latest security updates, which include enhanced input validation routines that prevent integer overflow conditions from occurring during normal application execution. System administrators should also implement monitoring solutions to detect unusual termination patterns that may indicate exploitation attempts. Additionally, developers should conduct thorough code reviews focusing on integer handling practices and implement defensive programming techniques such as bounds checking, overflow detection mechanisms, and comprehensive testing procedures that include edge case scenarios involving maximum integer values to prevent similar vulnerabilities from emerging in future software releases.