CVE-2026-64754 in iOS
Summary
by MITRE • 07/28/2026
An out-of-bounds write issue was addressed with improved bounds checking. 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 a denial-of-service.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a classic out-of-bounds write flaw that was remediated through enhanced bounds checking mechanisms within Apple's operating systems. The issue manifests when processing malformed or maliciously crafted files, where the system fails to properly validate array indices or buffer limits before writing data. Such vulnerabilities typically arise from insufficient input validation and can be exploited by attackers who craft specific file formats designed to trigger memory corruption conditions. The fix implemented in iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, and watchOS 26.6 demonstrates Apple's proactive approach to addressing memory safety issues that could compromise system stability.
The technical nature of this vulnerability aligns with CWE-787, which specifically addresses out-of-bounds write conditions in software systems. This classification indicates that the flaw allows an attacker to write data beyond the boundaries of allocated memory regions, potentially corrupting adjacent memory locations or triggering system crashes. From an operational perspective, the impact is classified as denial-of-service since successful exploitation results in system instability rather than arbitrary code execution or privilege escalation. The vulnerability affects multiple Apple platforms simultaneously, suggesting it resides in shared core components or frameworks that handle file processing across different operating environments.
From a threat modeling standpoint, this vulnerability falls within ATT&CK technique T1203, which involves the use of malicious files to trigger system instability or crashes. While the immediate impact is limited to denial-of-service conditions, such vulnerabilities represent potential entry points for more sophisticated attacks in layered exploitation scenarios. The remediation approach focuses on strengthening bounds checking mechanisms, which typically involves implementing additional validation routines before memory operations occur and ensuring proper array boundary verification during file parsing processes. Organizations should prioritize updating all affected systems to prevent potential exploitation attempts that could leverage this vulnerability for broader operational disruption.
The security implications extend beyond immediate system stability concerns as out-of-bounds write vulnerabilities often serve as precursors to more serious exploits when combined with other weaknesses in software architecture. Proper input validation and memory safety practices are critical defensive measures that should be implemented consistently across all file processing components within operating systems. The coordinated patch release across multiple Apple platforms demonstrates the interconnected nature of modern operating system security and highlights the importance of maintaining up-to-date system configurations to protect against known vulnerabilities.