CVE-2026-43807
Summary
by MITRE • 07/27/2026
A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 26.5.2 and iPadOS 26.5.2, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. A malicious accessory may be able to cause unexpected app termination.
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Analysis
by VulDB Data Team • 07/27/2026
A buffer overflow vulnerability has been identified and resolved through enhanced bounds checking mechanisms in multiple Apple operating system versions. This security flaw represents a classic memory corruption issue that occurs when an application attempts to write data beyond the allocated memory boundaries of a buffer, potentially leading to unpredictable behavior and system instability. The vulnerability specifically affects iOS 26.5.2 and iPadOS 26.5.2, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, and watchOS 26.6, indicating a widespread impact across Apple's ecosystem.
The technical implementation of this vulnerability stems from insufficient input validation and boundary checking within the affected system components. When processing data from external sources, particularly malicious accessories, the system fails to properly verify that incoming data fits within predetermined memory limits. This weakness allows an attacker to craft specially designed inputs that exceed buffer capacity, potentially triggering memory corruption that manifests as unexpected application termination. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and may also relate to CWE-122 for heap-based buffer overflows depending on the specific implementation context.
The operational impact of this vulnerability extends beyond simple application crashes to potentially enable more sophisticated attack vectors. While the immediate effect is described as unexpected app termination, buffer overflows of this nature often serve as precursors to more serious exploits including privilege escalation, arbitrary code execution, or system compromise. The fact that malicious accessories can trigger this condition suggests a hardware-level interface vulnerability where external devices can influence memory management through connected peripherals, representing a critical security gap in Apple's device interaction protocols.
Mitigation strategies should focus on immediate deployment of the patched operating system versions across all affected devices to eliminate the vulnerability at its source. Organizations and users must prioritize updating their systems to iOS 26.5.2, iPadOS 26.5.2, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, and watchOS 26.6 as these releases contain the necessary bounds checking improvements. Additionally, implementing network segmentation and access controls for devices that connect to external accessories can provide defense-in-depth measures while awaiting full patch deployment. The vulnerability's resolution through improved bounds checking aligns with ATT&CK technique T1059.007 for command and scripting interpreter, suggesting that the fix addresses potential exploitation pathways through malicious accessory input manipulation rather than direct system compromise methods.