Memory Corruption in macOS via Malicious SMB Share

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: Apple Inc.

Description

A use-after-free issue was addressed with improved memory management. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Mounting a maliciously crafted SMB network share may lead to system termination.

CVSS Scores

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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-2026-43719

Affected Vendors & Products

Vendor	Product	Version / Range
apple	macos	27
apple	macos	15.8
apple	macos	26.7

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is a use-after-free vulnerability caused by improper memory management. Mounting a specially crafted SMB network share could trigger this flaw, potentially causing the system to terminate unexpectedly.

Impact Analysis

If exploited, this vulnerability could lead to system crashes when accessing a malicious SMB share. This may result in data loss or denial of service on affected macOS systems.

Mitigation Strategies

Update to macOS Golden Gate 27, macOS Sequoia 15.8, or macOS Tahoe 26.7 to address the use-after-free issue. Avoid mounting untrusted SMB network shares until the update is applied.

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