CVE-2026-86922 in iOS
Summary
by MITRE • 10/20/2026
A type confusion issue was addressed with improved state management. This issue is fixed in Safari 27, iOS 27 and iPadOS 27, macOS Golden Gate 27, visionOS 27. Processing maliciously crafted web content may lead to arbitrary code execution.
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Analysis
by VulDB Data Team • 10/20/2026
The vulnerability described involves a critical type confusion flaw within the WebKit rendering engine, which powers Safari on Apple platforms including iOS, iPadOS, macOS, and visionOS. Type confusion is a severe class of memory corruption vulnerabilities where an application incorrectly handles data types during runtime operations. In this specific instance, the issue stemmed from inadequate state management logic that failed to properly validate or transition object states before performing type-specific operations. When the engine processes web content, it relies on strict adherence to expected data structures and types. If a maliciously crafted webpage can trigger a scenario where an object is treated as one type when it is actually another, the internal assumptions about memory layout and method availability become invalid. This discrepancy allows for unpredictable behavior that extends beyond normal application boundaries.
The operational impact of this vulnerability is significant because successful exploitation can lead to arbitrary code execution with the privileges of the target process. An attacker could craft a malicious website containing specially designed JavaScript or HTML content that exploits the type confusion flaw. By triggering the incorrect state transition, the attacker gains control over memory operations, potentially allowing them to execute arbitrary commands on the user's device. This capability effectively bypasses standard security mitigations such as sandboxing if the exploit chain is sufficiently sophisticated, leading to a complete compromise of the system integrity. The fact that this issue was addressed through improved state management indicates that the root cause lay in how the engine tracked and validated object lifecycles and type identities during complex web interactions.
From an industry standards perspective, this vulnerability aligns with CWE-843, which covers access to incorrect memory location due to type confusion, and often intersects with CWE-120 for buffer overflows if the misinterpretation leads to out-of-bounds writes or reads. In terms of attack vectors, this falls under ATT&CK technique T1205.008, specifically Web Service Delivery, where attackers use malicious web content as a vector to deliver exploits. The vulnerability highlights the ongoing challenges in maintaining robust type safety and state validation within high-performance JavaScript engines that must handle diverse and potentially untrusted input from the open web.
Mitigation strategies primarily rely on applying the software updates provided by Apple for Safari 27, iOS 27, iPadOS 27, macOS Golden Gate 27, and visionOS 27. These patches contain the necessary fixes to enforce stricter type checking and improve state management protocols within WebKit. Users should ensure their devices are updated immediately to close this attack surface. Additionally, organizations can implement browser security policies that restrict execution of untrusted scripts or disable JavaScript in high-risk environments where web content is not fully trusted. Regular monitoring for new CVEs related to WebKit and prompt patching remain essential practices for maintaining a secure posture against such memory corruption vulnerabilities.