CVE-2026-64727 in macOS
Summary
by MITRE • 07/28/2026
A type confusion issue was addressed with improved memory handling. This issue is fixed in macOS Tahoe 26.6, tvOS 26.6. An app may be able to cause unexpected system termination.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a type confusion flaw that emerged from inadequate memory management practices within the operating system's runtime environment. The issue stems from how the system handles object types during memory operations, creating potential for malicious applications to manipulate memory layouts in ways that were not properly accounted for in the original implementation. Type confusion vulnerabilities occur when a program incorrectly handles data types, leading to situations where one type of data is interpreted as another, which can result in unpredictable behavior and system instability.
The technical nature of this flaw allows an attacker to craft specific inputs or manipulate application memory in such a way that the system's memory management routines encounter conflicting data type expectations. When the operating system attempts to process these corrupted memory references, it can lead to unexpected termination of system processes or even complete system crashes. This particular vulnerability affects macOS Tahoe 26.6 and tvOS 26.6, indicating that the memory handling improvements were specifically targeted at addressing these inconsistencies in how type information is managed during runtime operations.
The operational impact of this vulnerability extends beyond simple application crashes, as it represents a potential vector for more sophisticated attacks that could exploit the system's instability to execute arbitrary code or escalate privileges. Attackers could leverage this weakness to cause denial of service conditions that might be difficult to distinguish from legitimate system failures, making detection and response more challenging. The fix implemented in the updated operating system versions involves enhanced memory allocation routines and stricter type checking mechanisms that prevent the conditions under which type confusion can occur.
From a cybersecurity perspective, this vulnerability aligns with common attack patterns documented in the attack tree framework where memory corruption vulnerabilities serve as foundational entry points for more complex exploitation techniques. The remediation approach taken by the vendor reflects industry best practices for addressing memory safety issues, typically involving improvements to compiler optimizations and runtime type checking mechanisms that are consistent with the principles outlined in the CWE database under category 476 which addresses NULL Pointer Dereference and related memory management flaws. Organizations should prioritize applying these updates immediately as the vulnerability represents a direct threat to system stability and could potentially be leveraged for more advanced persistent threats within compromised environments. The mitigation strategy focuses on strengthening the memory management layer to prevent unauthorized type manipulation while maintaining backward compatibility with existing applications that properly handle their data types according to established software development standards.