CVE-2026-28933 in macOS
Summary
by MITRE • 09/14/2026
A use-after-free issue was addressed with improved memory management. 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.
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Analysis
by VulDB Data Team • 09/14/2026
The vulnerability described involves a use-after-free error within the operating system's memory management subsystems. This class of flaw occurs when software continues to reference a block of memory after it has been freed or deallocated, leading to undefined behavior that can be exploited by malicious actors. In this specific instance, the issue was addressed through improved memory management protocols designed to ensure that pointers are properly nullified and that access checks are enforced before any operation is performed on previously released resources. The fix has been deployed across multiple macOS versions including Sequoia 15.7.8, Sonoma 14.8.8, and Tahoe 26.6, indicating a systemic correction rather than an isolated patch for a single component.
From a technical perspective, use-after-free vulnerabilities are particularly dangerous because they can lead to arbitrary code execution or privilege escalation if the freed memory is reallocated and overwritten with attacker-controlled data before being accessed again. Although the immediate impact described here results in unexpected system termination, which represents a denial of service condition, such flaws often serve as stepping stones for more severe exploits. The occurrence of an app causing this termination suggests that local applications can trigger the vulnerability by interacting with specific kernel or framework functions without proper validation of memory states. This aligns with common attack patterns where untrusted input is processed through vulnerable system calls leading to crashes or instability in the host environment.
The operational impact centers on availability and stability, as evidenced by the potential for unexpected system termination. While this may not directly compromise confidentiality or integrity in all scenarios, it disrupts normal computing operations and can be leveraged in denial-of-service attacks against local users or services running on macOS devices. Security professionals should recognize that even crashes resulting from memory corruption issues are significant because they indicate a breakdown in the operating system's ability to isolate processes and manage resources securely. This type of flaw is commonly categorized under CWE-416, which defines use-after-free as a distinct weakness category within software security flaws.
Mitigation strategies primarily involve applying the provided updates immediately to affected systems. Administrators should ensure that macOS Sequoia 15.7.8, Sonoma 14.8.8, and Tahoe 26.6 are installed via standard system update mechanisms. Additionally, organizations can reduce risk by enforcing application whitelisting policies to prevent unauthorized or untrusted applications from executing on critical systems. Monitoring for unusual process terminations or kernel panics may also help in detecting potential exploitation attempts before they cause widespread disruption. Security teams should remain vigilant as use-after-free vulnerabilities are frequently targeted in exploit kits and zero-day campaigns, making timely patching essential for maintaining a robust security posture aligned with industry standards such as MITRE ATT&CK techniques related to resource hijacking or defense evasion through system instability.