CVE-2026-83997

Analyzed Analyzed - Analysis Complete

Use After Free in Windows Message Queuing Allows Remote Code Execution

Publication date: 2026-09-08

Last updated on: 2026-09-11

Assigner: Microsoft Corporation

Description

Use after free in Windows Message Queuing allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-08

Last Modified

2026-09-11

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-83997

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2025	to 10.0.26100.33438 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7725 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7725 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7725 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7725 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7725 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7725 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7582 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7582 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9445 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9445 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9445 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9445 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2954 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2954 (exc)
microsoft	windows_server_2022	to 10.0.20348.5622 (exc)

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 in Windows Message Queuing. It allows an unauthorized attacker to execute arbitrary code over a network by exploiting a memory corruption issue where freed memory is accessed improperly.

Impact Analysis

An attacker could remotely execute malicious code on your system, potentially leading to data theft, system compromise, or further network infiltration. This could affect confidentiality, integrity, and availability of your data and services.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR's data protection requirements and HIPAA's security rules. Organizations may face compliance penalties, legal liabilities, and reputational damage if exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft for Windows Message Queuing. Monitor Microsoft's update guide for patches and install them as soon as available to prevent remote code execution.

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