CVE-2026-64757 in iOS
Summary
by MITRE • 07/28/2026
A memory corruption issue was addressed with improved state management. This issue is fixed in Safari 26.6, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected Safari crash.
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Analysis
by VulDB Data Team • 07/28/2026
This memory corruption vulnerability represents a critical security flaw that was successfully mitigated through enhanced state management protocols within Apple's web browser ecosystem. The issue stems from inadequate handling of malformed web content during processing, which can trigger unpredictable behavior in Safari's memory allocation mechanisms. When users encounter specifically crafted malicious web pages, the browser's state management fails to properly handle the corrupted data structures, leading to memory corruption that ultimately results in application instability and unexpected crashes. This vulnerability affects multiple Apple platforms including iOS, iPadOS, macOS, visionOS, watchOS, and Safari itself, demonstrating the widespread nature of the memory management flaw across Apple's operating system suite.
The technical implementation of this vulnerability aligns with common memory corruption patterns typically classified under CWE-129 or CWE-787, where improper bounds checking allows unauthorized memory access. The root cause lies in how Safari manages its internal state during web content rendering processes, particularly when encountering malformed HTML, JavaScript, or multimedia elements that exceed expected memory boundaries. Attackers can exploit this weakness by crafting malicious web pages designed to trigger specific memory allocation patterns that cause the browser to overwrite critical memory regions or corrupt heap structures. The vulnerability's manifestation as an unexpected crash indicates that the system's error handling mechanisms are insufficient to gracefully recover from the corrupted state, suggesting a lack of proper exception handling and memory protection protocols.
The operational impact of this vulnerability extends beyond simple application instability, as it provides potential attackers with a reliable method for causing denial-of-service conditions against Safari users. When exploited successfully, the vulnerability can be leveraged in targeted attacks where malicious websites cause repeated crashes, potentially disrupting user productivity or serving as a stepping stone for more sophisticated attacks. The crash behavior also presents opportunities for information disclosure, as memory corruption can sometimes reveal sensitive data structures or system information through crash dumps. Security researchers have noted that such vulnerabilities often serve as precursors to more serious exploits, particularly when combined with other weaknesses in the browser's security architecture, making prompt remediation essential for maintaining user safety.
Apple's resolution of this vulnerability through version updates demonstrates the company's commitment to maintaining robust memory management practices across its platform. The patches included in Safari 26.6 and corresponding operating system versions implement enhanced state validation mechanisms that properly handle malformed web content without causing memory corruption. These improvements likely involve stricter input validation, improved memory allocation bounds checking, and more resilient error handling procedures that prevent the browser from entering corrupted states. Organizations should prioritize immediate deployment of these security updates across all affected systems to protect against potential exploitation attempts. Security teams should also implement monitoring for unusual Safari crash patterns that might indicate attempted exploitation of this vulnerability, while maintaining awareness of related threats in the broader cybersecurity landscape that could leverage similar memory corruption techniques.