CVE-2026-86957 in iOS
Summary
by MITRE • 10/20/2026
An out-of-bounds read 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. An attacker in wireless proximity may be able to cause unexpected system termination.
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Analysis
by VulDB Data Team • 10/20/2026
The vulnerability described constitutes an out-of-bounds read flaw within the Apple operating systems ecosystem, specifically affecting iOS, iPadOS, macOS, tvOS, visionOS, and watchOS versions prior to those listed as fixed. This type of memory safety error occurs when a program reads data from a memory location that lies outside the intended buffer boundaries. In this specific instance, the issue was addressed through improved bounds checking mechanisms within the underlying codebase. The presence of such a flaw indicates a failure in validating input parameters or array indices before accessing memory regions, which is a classic manifestation of improper access control over allocated resources.
From a technical perspective, out-of-bounds reads are particularly dangerous because they can lead to information disclosure without necessarily allowing immediate arbitrary code execution. When an attacker triggers this condition by sending maliciously crafted data via wireless proximity interfaces, the application may read sensitive memory contents that were not intended for exposure. This could include cryptographic keys, session tokens, or other confidential system states residing in adjacent memory blocks. The lack of strict boundary validation allows the process to access these protected areas, potentially leaking critical information that aids further exploitation stages such as privilege escalation or remote code execution attempts against more hardened targets.
The operational impact of this vulnerability is significant due to its potential for denial of service and data leakage. As noted in the advisory, an attacker positioned within wireless proximity can exploit this flaw to cause unexpected system termination. This indicates that while the primary nature of the bug is a read violation, it may also lead to memory corruption or trigger assertion failures that crash the affected process or entire subsystem. Such instability disrupts service availability and undermines user trust in device reliability. Furthermore, if the out-of-bounds read successfully retrieves sensitive data before causing termination, it creates a persistent security risk where attackers can harvest confidential information over time through repeated exploitation attempts leveraging wireless communication channels like Bluetooth or Wi-Fi Direct depending on the specific component involved.
This vulnerability aligns with CWE-125, which defines Out-of-Bounds Read as accessing memory beyond the bounds of an array or buffer. It also relates to ATT&CK technique T1083, File and Directory Discovery, if the read operation is used to enumerate system files or configurations. Additionally, depending on how the leaked data is utilized, it may fall under T1567, Exfiltration Over Non-Encrypted Network Channel, especially if the wireless proximity interface allows for subsequent transmission of harvested data. The fix implemented in iOS 26.7 and later versions emphasizes the importance of robust input validation and memory safety checks to prevent such boundary violations from occurring during runtime operations involving external inputs or networked communications.
Mitigation strategies primarily involve applying the provided software updates immediately across all affected devices. For organizations managing large fleets, automated patch management systems should be configured to prioritize these security fixes given their potential for remote exploitation via wireless proximity. Administrators should also enforce strict device configuration policies that limit unnecessary exposure of wireless interfaces when not in active use, thereby reducing the attack surface available to nearby adversaries. Regular auditing of application behavior and memory usage patterns can help identify similar vulnerabilities during development phases before they reach production environments. Ultimately, maintaining up-to-date firmware is the most effective defense against known exploits targeting these specific boundary checking deficiencies.