CVE-2026-84489 in iOS
Summary
by MITRE • 09/15/2026
A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 18.7.10 and iPadOS 18.7.10, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8. An app may be able to cause a denial of service.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a buffer overflow condition within the operating system components of Apple's iOS and macOS platforms. A buffer overflow occurs when a program or process attempts to write more data to a block of memory than it is allocated to hold, leading to adjacent memories being overwritten with potentially malicious code. In this specific instance, the issue was addressed through improved bounds checking mechanisms designed to ensure that input data does not exceed the designated limits of the affected buffer. This technical flaw allows an application running on the device to trigger a denial-of-service condition by exploiting the insufficient validation of memory boundaries during processing operations.
The operational impact of this vulnerability is primarily centered around service availability rather than confidentiality or integrity in its current manifestation. An attacker who can execute code within the context of an app may be able to cause the affected system component to crash, hang, or become unresponsive. This results in a denial-of-service scenario where legitimate users are unable to access services provided by that specific subsystem. While buffer overflows often carry risks of arbitrary code execution due to memory corruption, the reported impact here is limited to availability disruption. However, it remains critical as it can destabilize core system functions and degrade user experience significantly if triggered repeatedly or in conjunction with other vulnerabilities.
From a classification perspective, this vulnerability aligns with CWE-120: Buffer Copy without Checking Size of Input Classic, which describes the failure to verify that input data fits within the allocated buffer space. Additionally, it relates to CWE-787: Out-of-bounds Write, as the overflow implies writing beyond the intended memory boundaries. In terms of adversary tactics and techniques framework mapping, this vulnerability could potentially be leveraged in conjunction with ATT&CK technique T1059 Command and Scripting Interpreter if an attacker seeks further exploitation after achieving initial code execution or process instability. It also touches upon availability-focused attacks under potential abuse vectors that disrupt system stability for denial-of-service purposes.
Mitigation strategies involve applying the provided software updates immediately to affected devices. The issue is resolved in iOS 18.7.10, iPadOS 18.7.10, iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.7.8, and macOS Sonoma 14.8.8. Administrators should ensure that all endpoints are patched to the latest stable release containing these fixes. For developers creating applications for these platforms, it is essential to implement rigorous input validation and use safe string handling functions that automatically enforce length limits. Regular security audits and static code analysis tools can help identify similar bounds-checking deficiencies before deployment, reducing the attack surface available to potential exploiters seeking to disrupt system availability through memory corruption flaws.