CVE-2026-20664
Received Received - Intake
Memory Handling Flaw in Safari Causes Process Crash

Publication date: 2026-03-25

Last updated on: 2026-03-25

Assigner: Apple Inc.

Description
The issue was addressed with improved memory handling. This issue is fixed in Safari 26.4, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4. Processing maliciously crafted web content may lead to an unexpected process crash.
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Meta Information
Published
2026-03-25
Last Modified
2026-03-25
Generated
2026-06-16
AI Q&A
2026-03-25
EPSS Evaluated
2026-06-15
NVD
CVE-2026-20664
EUVD
EUVD-2026-15050
Affected Vendors & Products
Showing 5 associated CPEs
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
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
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Executive Summary

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.

Impact Analysis

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.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

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.

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