Heap-based Buffer Overflow in Windows Message Queuing

Executive Summary

CVE-2026-54992 is a heap-based buffer overflow vulnerability in the Windows Message Queuing Queue Manager. This flaw allows an unauthorized attacker to execute arbitrary code on a vulnerable system locally.

A heap-based buffer overflow occurs when a program writes more data to a buffer than it can hold, corrupting or overwriting adjacent memory. In this case, the vulnerability exists in the Windows Message Queuing service, which could be exploited to gain control over the affected system.

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Detection Guidance

To detect the presence of the Windows Message Queuing (MSMQ) service, which is affected by CVE-2026-54992, you can check if the service is running on your system.

• On Windows, open a Command Prompt with administrative privileges and run the following command to check if the MSMQ service is installed and running: sc query MSMQ.
• If the service is running, you can also verify its status using: Get-Service -Name MSMQ (in PowerShell).

Additionally, you can check for the presence of the MSMQ feature in Windows Features or use vulnerability scanning tools to identify systems with the vulnerable service enabled.

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Impact Analysis

This vulnerability can have severe impacts if exploited. Here are the potential consequences:

• An attacker could execute arbitrary code on your system with the privileges of the Message Queuing service, potentially taking full control of the affected machine.
• Unauthorized access to sensitive data stored on the system or accessible through it.
• Disruption of critical services or applications relying on the Windows Message Queuing service.
• The vulnerability could be used as a stepping stone for further attacks within a network, especially if the affected system has elevated privileges.

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Compliance Impact

This vulnerability could impact compliance with several standards and regulations, depending on the context of the affected system:

• GDPR: If the affected system processes or stores personal data of EU citizens, a successful exploit could lead to unauthorized access or disclosure of this data. This would violate GDPR's requirements for data protection and could result in significant fines.
• HIPAA: For systems handling protected health information (PHI) in the U.S., exploitation of this vulnerability could lead to unauthorized access to PHI, violating HIPAA's Security Rule and potentially leading to penalties.
• Other standards like PCI DSS, ISO 27001, or NIST frameworks require organizations to maintain secure systems and protect against known vulnerabilities. Failure to patch or mitigate this vulnerability could result in non-compliance with these standards.

Organizations should assess whether the affected system handles regulated data and take appropriate steps to mitigate the risk to maintain compliance.

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Mitigation Strategies

Immediate steps to mitigate CVE-2026-54992 include the following:

• Apply the latest security update from Microsoft as soon as possible. Refer to the Microsoft Security Response Center (MSRC) for the patch specific to this CVE.
• If patching is not immediately feasible, disable the Windows Message Queuing (MSMQ) service to prevent exploitation. This can be done via the Services management console (services.msc) or using the command: sc stop MSMQ followed by sc config MSMQ start= disabled.
• Restrict network access to systems running the MSMQ service to trusted networks or hosts only.
• Monitor systems for unusual activity, particularly those running the MSMQ service, as exploitation may leave traces in logs.

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