Out-of-Bounds Read in macOS Golden Gate 27

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: Apple Inc.

Description

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may lead to unexpected system termination.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-14

Last Modified

2026-09-14

Generated

2026-09-15

AI Q&A

2026-09-15

EPSS Evaluated

N/A

NVD

CVE-2026-84509

Affected Vendors & Products

Vendor	Product	Version / Range
apple	macos_golden_gate	27
apple	macos_sequoia	15.8
apple	macos_tahoe	26.7

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is an out-of-bounds read vulnerability caused by insufficient bounds checking. When a system connects to a malicious SMB server, it may read memory outside the intended buffer, potentially causing the system to terminate unexpectedly.

Impact Analysis

If exploited, this vulnerability could lead to unexpected system crashes when connecting to a malicious SMB server. It does not appear to allow arbitrary code execution or data theft based on the provided details.

Mitigation Strategies

Update to the latest versions of macOS Golden Gate 27, macOS Sequoia 15.8, or macOS Tahoe 26.7 to address the out-of-bounds read vulnerability.

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