In this long read post, we're going to delve deep into the details of a recently patched security vulnerability that was affecting multiple Apple operating systems. Termed as CVE-2022-26763, this flaw is an out-of-bounds access issue that could allow a malicious application to execute arbitrary code with system privileges. Apple has fixed this critical problem in a number of software updates, including tvOS 15.5, iOS 15.5 and iPadOS 15.5, Security Update 2022-004 Catalina, watchOS 8.6, macOS Big Sur 11.6.6, and macOS Monterey 12.4.

To get started, let's first understand what an out-of-bounds access issue is, by drawing on a simple code snippet:

#include <stdio.h>

int main() {
  int arr[5] = {, 1, 2, 3, 4};
  int index = 6;
  printf("%d\n", arr[index]);
  return ;

In this example, the arr variable is an array with a fixed size of 5. When the index variable is set to 6, trying to access arr[index] in the printf function will result in an out-of-bounds access, as the index is invalid for the size of the array. Accessing data beyond the limits of the array is dangerous as it can expose unintended memory locations and potentially lead to the execution of malicious code.

In the case of CVE-2022-26763, inadequate bounds-checking allowed an attacker to craft a malicious application that exploits this vulnerability and gains elevated privileges on the system. This could result in serious consequences, such as unauthorized access to sensitive data, control over the device or its functionality, and even a complete takeover of the device.

To address this issue, Apple has released software updates for different operating systems that include improved bounds-checking and other security measures to mitigate the risk of exploiting CVE-2022-26763.

For comprehensive information on these updates and the specific operating systems affected, we recommend referring to the official Apple security advisory (, which also provides links to the respective download pages for each update.

Moreover, the National Institute of Standards and Technology (NIST) maintains the National Vulnerability Database (NVD), a trustworthy repository of vulnerability details and patch information. NIST has provided a comprehensive description of the CVE-2022-26763 on their website (, complete with severity scores, vulnerability assessment tools, and background information.

In conclusion, CVE-2022-26763 is a critical out-of-bounds access vulnerability that could compromise the security of an Apple device. To protect your devices against this issue, it's essential to promptly install the security updates provided by Apple, depending on your operating system. This will not only keep your devices secure, but it'll also help to maintain your digital safety and privacy against potential exploitation by malicious agents.


Published on: 05/26/2022 20:15:00 UTC
Last modified on: 06/08/2022 12:49:00 UTC