CVE-2026-69618

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Out-of-bounds Read in Windows SMB Client

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Windows SMB Client allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-09

AI Q&A

2026-09-09

EPSS Evaluated

N/A

NVD

CVE-2026-69618

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_smb_client	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This is an out-of-bounds read vulnerability in the Windows SMB Client. It allows an authorized attacker to read memory outside the intended buffer, potentially exposing sensitive information on the local system.

Impact Analysis

An attacker with local access could exploit this to disclose confidential data stored on your system, such as passwords or personal files. The impact is limited to information disclosure and does not allow code execution or privilege escalation.

Compliance Impact

This vulnerability could lead to unauthorized disclosure of personal or sensitive data, which may violate GDPR or HIPAA requirements for data protection and confidentiality. Organizations must address it to maintain compliance.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows SMB Client vulnerability. Disable SMBv1 protocol if not required and restrict SMB access through firewall rules to minimize exposure.

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