CVE-2026-43719

Undergoing Analysis Undergoing Analysis - In Progress

Memory Corruption in macOS via Malicious SMB Share

Publication date: 2026-09-14

Last updated on: 2026-09-15

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

EPSS Scores

Probability:
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Meta Information

Published

2026-09-14

Last Modified

2026-09-15

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

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-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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.

Detection Guidance

This vulnerability involves a use-after-free issue in macOS related to SMB network shares. Detection may require monitoring for system crashes or unusual behavior when mounting SMB shares. No specific commands are provided in the available context.

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.

Compliance Impact

The provided CVE data does not specify any direct impact on compliance with standards like GDPR or HIPAA. The vulnerability involves a use-after-free issue in macOS that could lead to system termination when mounting a maliciously crafted SMB network share. Without explicit details on data exposure or privacy implications, its compliance impact remains unclear.

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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