CVE-2026-84511 in iPadOS
Summary
by MITRE • 09/15/2026
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, watchOS 27. Processing a maliciously crafted asset catalog may lead to unexpected process termination.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves an out-of-bounds write condition within the processing logic for asset catalogs on Apple operating systems including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. An out-of-bounds write occurs when a program writes data to a memory location outside the boundaries of the intended buffer or array. This type of flaw is typically classified under CWE-787 as an Out-of-Bounds Write vulnerability. The root cause lies in insufficient validation of input parameters during the parsing and handling of asset catalog files, which are commonly used to store resources such as images, sounds, and other media assets for applications. When a maliciously crafted asset catalog is processed, the application fails to correctly verify that write operations remain within allocated memory limits, allowing an attacker to overwrite adjacent memory structures.
The operational impact of this vulnerability centers on the potential for unexpected process termination. While out-of-bounds writes can sometimes lead to arbitrary code execution if controlled precisely by an attacker, in this specific instance, Apple has indicated that the primary consequence is denial of service through application crash. This occurs because the corrupted memory state triggers a fatal exception or segmentation fault within the operating system's security mechanisms, such as Memory Protection Extensions (MXP) on ARM-based devices or similar protections on x86 architectures. The unexpected termination disrupts normal user operations and can degrade system stability if critical background services are affected. Although the immediate impact is limited to availability rather than confidentiality or integrity in most cases, out-of-bounds writes remain a high-risk vulnerability class because they provide an attack surface that could potentially be exploited for more severe outcomes depending on memory layout and exploitation techniques employed by sophisticated adversaries.
From a threat modeling perspective, this flaw aligns with ATT&CK technique T1059 Command and Scripting Interpreter if the crash is leveraged to trigger further execution flows, or more accurately with initial access vectors involving malicious file processing. Attackers could distribute crafted asset catalogs via phishing emails, compromised websites, or supply chain attacks targeting app development tools. The exploitation requires the victim to open or process the malicious file within an affected application that utilizes these asset catalog structures. Given the widespread use of iOS and macOS ecosystems for both consumer and enterprise environments, the potential attack surface is significant. However, the complexity of reliably exploiting out-of-bounds writes without achieving code execution limits the immediate threat level compared to vulnerabilities like buffer overflows with direct control flow hijacking capabilities.
Mitigation strategies primarily involve applying the software updates provided by Apple across all affected platforms including iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27. These updates contain improved bounds checking logic that validates memory access operations before execution, ensuring that writes do not exceed allocated buffer boundaries. Developers should also implement defensive coding practices such as using safe string handling functions, enabling compiler-based security features like Stack Canaries or Address Sanitizers during development, and performing rigorous input validation on all external data sources including asset catalogs. Regular patch management is essential to maintain system integrity against known vulnerabilities of this nature. Organizations should prioritize updating devices in their fleets to ensure that the underlying memory safety mechanisms are up to date, thereby reducing the risk of exploitation through maliciously crafted files designed to trigger these specific processing flaws.