CVE-2026-20664
Memory Handling Flaw in Safari Causes Process Crash
Publication date: 2026-03-25
Last updated on: 2026-03-25
Assigner: Apple Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| apple | ipados | to 26.4 (exc) |
| apple | iphone_os | to 26.4 (exc) |
| apple | macos | From 26.0 (inc) to 26.4 (exc) |
| apple | visionos | to 26.4 (exc) |
| apple | safari | to 26.4 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-787 | The product writes data past the end, or before the beginning, of the intended buffer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2026-20664 is a security vulnerability in WebKit, the engine used by Safari and other Apple platforms. It involves a logic flaw in the Navigation API that allows maliciously crafted web content to bypass the Same Origin Policy, potentially accessing script message handlers intended for other origins.
This flaw can be triggered by processing specially crafted web content, which may lead to unexpected process crashes or unauthorized cross-origin data access.
The issue was addressed by Apple through improved memory handling, state management, and input validation in Safari 26.4, iOS 26.4, iPadOS 26.4, macOS Tahoe 26.4, and visionOS 26.4.
How can this vulnerability impact me? :
This vulnerability can impact users by allowing malicious websites to bypass the Same Origin Policy, potentially accessing or manipulating data from other web origins without permission.
Such unauthorized access could lead to privacy breaches or exposure of sensitive information.
Additionally, processing maliciously crafted content may cause unexpected process crashes, which can disrupt normal device or browser operation.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, update affected Apple software to version 26.4 or later where the issue is fixed.
- Update Safari to version 26.4 or later on macOS Sonoma and macOS Sequoia.
- Update iOS and iPadOS devices to version 26.4 or later.
- Update visionOS on Apple Vision Pro devices to version 26.4 or later.
These updates include improved memory handling and input validation that address the vulnerability.