CVE-2026-62782

Analyzed Analyzed - Analysis Complete

Out-of-bounds Read in Windows SMB Client

Publication date: 2026-08-11

Last updated on: 2026-08-16

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Windows SMB Client allows an unauthorized attacker to disclose information over a network.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-11

Last Modified

2026-08-16

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-62782

EUVD

EUVD-2026-56664

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_server_2016	to 10.0.14393.9418 (exc)
microsoft	windows_server_2019	to 10.0.17763.9115 (exc)
microsoft	windows_server_2022	to 10.0.20348.5440 (exc)
microsoft	windows_server_2025	to 10.0.26100.33222 (exc)

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 vulnerability is an out-of-bounds read issue in the Windows SMB Client. It allows an unauthorized attacker to read beyond the intended memory area, which can lead to disclosure of sensitive information over a network.

Detection Guidance

Detection requires monitoring for unusual SMB client behavior or network traffic anomalies. Use network monitoring tools like Wireshark to inspect SMB traffic for malformed packets. Check Windows Event Logs for SMB-related errors or crashes. Ensure all Windows systems are updated with the latest security patches from Microsoft.

Impact Analysis

An attacker could exploit this to access confidential data on your system without authentication. This may include sensitive files, credentials, or other private information transmitted over the network.

Compliance Impact

This vulnerability could lead to unauthorized data exposure, violating GDPR's data protection principles or HIPAA's security requirements for protected health information. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows SMB Client vulnerability. Monitor Microsoft's security advisories for updates and disable SMBv1 if not required to reduce attack surface.

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