CVE-2026-84532 in iOS
Summary
by MITRE • 09/15/2026
An out-of-bounds read issue was addressed with improved input validation. 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. Opening a maliciously crafted file may cause unexpected process termination or disclose process memory.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described constitutes an out-of-bounds read flaw within the Apple operating system ecosystem, specifically affecting iOS, iPadOS, macOS, tvOS, and visionOS platforms. This type of security issue arises when a software application reads data from a memory location that lies outside the intended buffer boundary. In this specific instance, the root cause is attributed to insufficient input validation mechanisms during the processing of file inputs. When an attacker provides a maliciously crafted file designed to exploit these boundaries, the application fails to properly verify whether the requested read operation stays within allocated memory limits. This lack of rigorous bounds checking allows the program to access memory segments that are not meant for public consumption or even system integrity checks, leading to unpredictable behavior and potential security breaches.
From a technical perspective, an out-of-bounds read is classified under CWE-125 in the Common Weakness Enumeration standard. It represents a scenario where software reads past the end of a buffer, potentially exposing sensitive information stored in adjacent memory locations. The operational impact of this vulnerability is significant because it can lead to two primary adverse outcomes: unexpected process termination and disclosure of process memory. Unexpected process termination indicates that the application may crash when encountering invalid data structures or corrupted headers within the malicious file. This denial-of-service aspect disrupts user productivity and system stability. More critically, the potential for disclosing process memory poses a severe confidentiality risk. By reading beyond allocated buffers, an attacker might extract sensitive data such as cryptographic keys, session tokens, passwords, or other private information residing in the application's address space that was not intended to be exposed.
This vulnerability aligns with several tactics and techniques within the MITRE ATT&CK framework. The act of opening a maliciously crafted file suggests initial access vectors often associated with social engineering or drive-by downloads where users are tricked into executing or viewing compromised documents. Once executed, the exploitation technique falls under Data from Local System (T1005), specifically leveraging out-of-bounds reads to exfiltrate information without direct network transmission initially. The ability to crash processes also relates to Denial of Service impacts, although in this context, it serves more as a side effect or a means to trigger further exploitation rather than the primary goal for sophisticated attackers who prefer silent data extraction.
Mitigation strategies primarily rely on the software updates provided by Apple. Users and administrators must ensure that their devices are running iOS 26.7 or later, iPadOS 26.7 or later, macOS Sequoia 15.8 or later, along with the specified versions of macOS Golden Gate, Tahoe, tvOS, and visionOS. These updates contain improved input validation logic designed to detect and reject malformed file structures before they can trigger out-of-bounds memory accesses. Beyond applying patches, defense-in-depth measures should be employed. Security teams should enforce strict application whitelisting to prevent unauthorized applications from processing untrusted files. Additionally, enabling sandboxing for applications that handle external inputs limits the potential blast radius if a vulnerability is successfully exploited. Regular security audits and static code analysis tools can help identify similar input validation weaknesses in custom or third-party software before they reach production environments.