CVE-2026-86882 in iOS
Summary
by MITRE • 09/15/2026
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7 and iPadOS 26.7, 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 image may lead to unexpected process termination.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described constitutes an out-of-bounds write condition within the image processing subsystem of Apple operating systems, including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. This type of memory corruption flaw typically arises when a software component fails to properly validate input data before writing it to a designated buffer in memory. In this specific instance, the system processes images that are maliciously crafted to exceed expected dimensions or structural constraints. When such an image is processed, the application attempts to write data beyond the allocated boundaries of its internal buffers. This behavior indicates a failure in bounds checking logic, where the software does not adequately verify whether the target memory location falls within the permitted range before performing the write operation.
From a technical perspective, this flaw aligns with CWE-787: Out-of-bounds Write, which is categorized as a critical class of vulnerabilities due to its potential for severe system compromise. The immediate operational impact observed in this scenario is unexpected process termination, commonly referred to as a crash or denial of service. While the primary manifestation described here results in application instability rather than arbitrary code execution, out-of-bounds writes are inherently dangerous because they can corrupt adjacent memory structures. If an attacker can control the data written outside the buffer boundaries, it may be possible to overwrite critical metadata such as function pointers or exception handlers. This could potentially lead to remote code execution with elevated privileges, although the current report highlights process termination as the confirmed consequence.
The vulnerability affects a wide range of Apple platforms, indicating that the flawed image processing logic is shared across multiple operating system families. The affected versions include iOS 26.7 and iPadOS 26.7, along with their successors in the iOS 27 and iPadOS 27 lines. On macOS, the issue impacts macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. Additionally, tvOS 27, visionOS 27, and watchOS 27 are also vulnerable. This broad scope suggests that the underlying image parsing library or framework is a core component utilized by various applications across these ecosystems, increasing the attack surface for potential exploitation through maliciously crafted files delivered via email, messaging apps, or web content.
In terms of threat modeling, this vulnerability can be mapped to MITRE ATT&CK techniques related to initial access and execution. An attacker might leverage CWE-787 by embedding a specially constructed image within a document or webpage that the user is prompted to open or view. Upon processing, the out-of-bounds write triggers instability in the host application. While the immediate effect is a crash, which may disrupt productivity or cause data loss if unsaved work is involved, the underlying memory corruption remains a significant risk vector for more sophisticated attacks. Security researchers and developers must treat such flaws as potential gateways to privilege escalation or remote code execution until proven otherwise through rigorous static and dynamic analysis.
Mitigation strategies primarily rely on the deployment of software updates provided by Apple. Users should ensure that their devices are running iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, or watchOS 27 to benefit from the improved bounds checking mechanisms implemented in these releases. For developers integrating image processing libraries into custom applications, it is imperative to implement strict input validation and sanitization routines that verify buffer sizes against incoming data dimensions before any memory allocation or write operations occur. Adhering to secure coding standards such as those outlined by OWASP can help prevent similar out-of-bounds errors in future software development cycles.