CVE-2026-43774

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Out-of-Bounds Read in macOS

Publication date: 2026-07-27

Last updated on: 2026-07-29

Assigner: Apple Inc.

Description

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to access sensitive user data.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-27

Last Modified

2026-07-29

Generated

2026-08-17

AI Q&A

2026-07-28

EPSS Evaluated

2026-08-15

NVD

CVE-2026-43774

EUVD

EUVD-2026-49620

Affected Vendors & Products

Vendor	Product	Version / Range
apple	macos	From 14.0 (inc) to 14.8.8 (exc)
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

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds read issue where an app may access sensitive user data due to insufficient bounds checking. It affects multiple macOS versions including Sequoia, Sonoma, and Tahoe.

Detection Guidance

This vulnerability is specific to Apple macOS versions and requires checking system software versions. No direct detection commands are provided in the context. Verify your macOS version against the fixed releases: Sequoia 15.7.8, Sonoma 14.8.8, or Tahoe 26.6.

Impact Analysis

An attacker could exploit this to access sensitive user data on your device. The impact includes potential exposure of personal information if the app has access to such data.

Compliance Impact

This vulnerability could lead to unauthorized data access, potentially violating GDPR (data protection) or HIPAA (health data privacy) if sensitive user data is exposed. Compliance may be compromised if data breaches occur.

Mitigation Strategies

Update your macOS to the latest patched version immediately: Sequoia 15.7.8, Sonoma 14.8.8, or Tahoe 26.6. If updates are unavailable, consider isolating affected systems until patches are applied.

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