CVE-2026-43768 in macOS
Summary
by MITRE • 07/28/2026
The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a memory management flaw that could potentially lead to arbitrary system termination when exploited by malicious applications. The issue stems from inadequate memory handling mechanisms within the operating system's kernel or core frameworks, allowing an application to manipulate memory resources in ways that trigger unexpected system crashes or complete system failures. Such vulnerabilities typically arise from insufficient bounds checking, improper memory deallocation, or race conditions during memory allocation processes that could be exploited through carefully crafted malicious code or data inputs.
The technical nature of this flaw aligns with common software security weaknesses classified under CWE-129, which deals with insufficient validation of length of input buffers, and CWE-787, which addresses out-of-bounds write vulnerabilities. These classifications indicate that the vulnerability likely involves improper handling of memory boundaries where applications can write beyond allocated memory regions or read from invalid memory locations. The exploitation scenario suggests that an attacker could craft specific inputs or code sequences that when processed by the affected system components, would trigger memory corruption leading to system instability and potential complete termination.
The operational impact of this vulnerability extends beyond simple application crashes to encompass broader system reliability concerns and potential security implications. When an application can cause unexpected system termination, it creates opportunities for denial-of-service attacks that could disrupt critical system operations or services. In enterprise environments where system uptime is crucial, such vulnerabilities could lead to significant operational disruptions and require immediate remediation. The vulnerability affects multiple macOS versions including Sequoia 15.7.8, Sonoma 14.8.8, and Tahoe 26.6, indicating it's a widespread issue affecting various operating system releases.
The mitigation strategy involves applying the security updates provided in the affected macOS versions, which contain improved memory handling mechanisms and proper bounds checking procedures. Organizations should prioritize patching affected systems to prevent exploitation attempts that could result in unauthorized system access or service disruption. Security teams should monitor for any signs of exploitation attempts through system logs and network monitoring tools, as the vulnerability may be targeted by threat actors seeking to leverage system instability for more sophisticated attacks. The fix addresses fundamental memory management issues that align with ATT&CK technique T1499.004, which covers system shutdown/reboot following a successful exploitation attempt.
Modern security practices recommend implementing additional safeguards such as memory protection mechanisms, address space layout randomization, and heap metadata validation to further reduce the attack surface. System administrators should also consider implementing application whitelisting policies to prevent potentially malicious applications from executing on critical systems. The vulnerability demonstrates the importance of comprehensive memory management in operating system design and highlights how seemingly minor implementation flaws can have significant operational consequences across enterprise environments. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other system components that might present comparable risks to system stability and security.