CVE-2026-64734 in iOS
Summary
by MITRE • 07/28/2026
The issue was addressed with improved checks. 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, visionOS 26.6, watchOS 26.6. Processing a maliciously crafted contact may leak sensitive data.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a security flaw in Apple's mobile and desktop operating systems that could potentially lead to unauthorized data exposure through contact processing mechanisms. The issue was specifically addressed through enhanced validation checks within the system's contact handling components, which are critical for maintaining user privacy and system integrity. The vulnerability affects multiple Apple platforms including iOS, iPadOS, macOS across several versions, visionOS, and watchOS, indicating a widespread impact that required coordinated patching efforts across the entire Apple ecosystem.
The technical nature of this flaw suggests a weakness in input validation or sanitization processes when handling contact data structures. When processing maliciously crafted contact information, the system could inadvertently expose sensitive user data through improper handling of malformed or specially constructed contact records. This type of vulnerability typically falls under CWE-20 Improper Input Validation category, where insufficient checks on user-supplied data can lead to various security consequences including information disclosure, data corruption, or privilege escalation. The implementation of improved checks indicates that the original flaw likely involved inadequate sanitization of contact attributes or metadata that could be exploited to extract confidential information from system memory or storage.
The operational impact of this vulnerability extends across Apple's entire product portfolio, affecting millions of users who rely on these platforms for communication and data management. Users may have been at risk when receiving contact information from untrusted sources or when synchronizing contacts with potentially compromised third-party services. The vulnerability could have enabled attackers to craft specific contact entries that would trigger unexpected behavior in the system's contact processing pipeline, potentially leading to memory disclosure or other forms of sensitive data exposure. This type of information leak could expose personal identification details, communication patterns, or other confidential information stored within contact records.
The mitigation strategy involved implementing enhanced validation mechanisms that properly sanitize all incoming contact data before processing. These improved checks likely include stricter parsing of contact attributes, additional boundary validations, and more robust error handling for malformed input data. System administrators and users should ensure their devices are updated to the specified versions including iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6, visionOS 26.6, and watchOS 26.6 to protect against exploitation of this vulnerability. The coordinated patching across multiple platforms demonstrates Apple's approach to managing cross-platform security issues through consistent security updates that address similar vulnerabilities across their entire operating system ecosystem.
From an ATT&CK framework perspective, this vulnerability could be categorized under techniques related to information disclosure and privilege escalation through input manipulation. The attack surface likely involves initial access through contact data transmission followed by exploitation of the validation gap to achieve unauthorized data access. Security professionals should monitor for any indicators of compromise related to unusual contact processing activities or unexpected memory behavior that might suggest exploitation attempts. The vulnerability highlights the importance of comprehensive input validation and proper error handling in system components that process user-supplied data, particularly those involved in communication and contact management functions that are frequently targeted by attackers due to their widespread use and potential for data exposure.