CVE-2026-28991
Out-of-Bounds Read in Apple iOS and macOS
Publication date: 2026-05-11
Last updated on: 2026-05-11
Assigner: Apple Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| apple | ios | 26.5 |
| apple | ipad_os | 26.5 |
| apple | macos_tahoe | 26.5 |
| apple | tv_os | 26.5 |
| apple | vision_os | 26.5 |
| apple | watch_os | 26.5 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is an out-of-bounds read issue that was addressed by improving bounds checking in affected Apple operating systems. Essentially, it means that an application could read memory outside the intended boundaries, which can lead to unexpected behavior.
The issue has been fixed in iOS 26.5, iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, and watchOS 26.5.
How can this vulnerability impact me? :
An application may be able to cause a denial-of-service (DoS) condition due to this vulnerability. This means that an app could crash or become unresponsive, potentially disrupting normal device operation.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, update your Apple devices to the fixed versions of the operating systems: iOS 26.5, iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, and watchOS 26.5.
Applying these updates will address the out-of-bounds read issue by improving bounds checking and prevent potential denial-of-service attacks caused by this vulnerability.