Description

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. A remote attacker may be able to cause unexpected app termination or arbitrary code execution.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-09-14T21:17:25.057Z",
  "pubdate": "2026-09-14T21:17:25.057Z",
  "executiveSummary": "This vulnerability is an out-of-bounds write flaw caused by insufficient bounds checking within affected Apple operating systems. An attacker capable of triggering this condition can force an application to terminate unexpectedly or achieve arbitrary code execution on the target device.\nThe vulnerability affects a broad range of products, including 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, and watchOS 27.\nThe risk implication is significant due to the potential for arbitrary code execution, which allows an attacker to bypass security boundaries, potentially leading to unauthorized data access or full device compromise.\nExploitation is typically achieved remotely, requiring the victim to process malicious data or interact with a crafted trigger mechanism, thus enabling an attacker to gain control over the application's execution flow without prior authentication.",
  "technicalDetails": "The root cause of this vulnerability is a failure in the input validation logic within the affected component's memory management subsystem. Specifically, the system fails to correctly enforce bounds when performing write operations to a memory buffer. This leads to an out-of-bounds write scenario where data can be written beyond the allocated heap or stack buffer limits.\nAn out-of-bounds write occurs when a process attempts to write data to an address outside the intended memory region. In this case, the lack of rigorous bounds checking allows an attacker to craft input that overflows the allocated buffer, overwriting adjacent memory structures. By carefully manipulating the content and size of the input, an attacker can overwrite critical control data, such as function pointers, return addresses, or metadata related to object management.\nThe attack flow generally involves the attacker delivering a malicious payload to the application, which then processes this data through an vulnerable function lacking proper bounds verification. As the system writes the malicious payload into the buffer, the boundary check fails, and the data exceeds its designated capacity. The overflowing data spills into neighboring memory locations, enabling the attacker to divert the application's execution flow. If the attacker can control the overwritten memory, they can redirect execution to shellcode, Return-Oriented Programming (ROP) gadgets, or other malicious payloads.\nThe exploitation process typically follows a structured pattern: first, the attacker identifies a component that processes untrusted data without sufficient verification. Second, the attacker crafts a payload designed to trigger the overflow while carefully arranging the malicious contents to land on specific memory offsets. Finally, the attacker triggers the vulnerability by passing the crafted input to the target component. If successful, the system execution flow is hijacked.\nThe post-exploitation impact includes arbitrary code execution, which grants the attacker the same privileges as the compromised application. This could allow for persistent control over the user session, the exfiltration of sensitive information, or the deployment of further malicious software. Given the broad exposure across multiple Apple operating systems—including mobile, desktop, and embedded platforms—the potential attack surface is vast, allowing attackers to leverage the vulnerability against diverse user environments."
}