CVE-2026-43748
Analyzed Analyzed - Analysis Complete

Out-of-Bounds Write in macOS Sequoia

Publication date: 2026-07-27

Last updated on: 2026-07-28

Assigner: Apple Inc.

Description
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination.

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Meta Information

Published
2026-07-27
Last Modified
2026-07-28
Generated
2026-08-17
AI Q&A
2026-07-28
EPSS Evaluated
2026-08-15
NVD
CVE-2026-43748
EUVD
EUVD-2026-49497

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
apple macos From 15.0 (inc) to 15.7.8 (exc)
apple macos From 26.0 (inc) to 26.6 (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

This is an out-of-bounds write vulnerability caused by insufficient bounds checking. An application could write data outside the intended memory area, potentially leading to system crashes or unexpected behavior.

Detection Guidance

This vulnerability is specific to macOS Sequoia and Tahoe versions. Detection involves checking your macOS version against the fixed versions (Sequoia 15.7.8 or Tahoe 26.6). Use the command 'sw_vers' in Terminal to check your current macOS version.

Impact Analysis

An attacker could exploit this to cause unexpected system termination on affected devices running macOS Sequoia or Tahoe. This may result in data loss or denial of service for the user.

Compliance Impact

The provided CVE data does not specify any direct impact on compliance with standards like GDPR or HIPAA. The vulnerability involves an out-of-bounds write issue causing unexpected system termination, but no data exposure or privacy implications are mentioned.

Mitigation Strategies

Update your macOS to the latest fixed versions (Sequoia 15.7.8 or Tahoe 26.6) immediately. Enable automatic updates in System Settings > General > Software Update to prevent future vulnerabilities.

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