Double Free in Windows DHCP Server Allows Remote Code Execution

Executive Summary

CVE-2026-50685 is a vulnerability in the Windows DHCP Server. It involves a double free error, which occurs when a program incorrectly frees the same memory location twice. This flaw allows an authorized attacker to execute arbitrary code over a network.

The vulnerability is classified as a remote code execution (RCE) issue, meaning an attacker could potentially take control of the affected system if they exploit this flaw successfully.

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Detection Guidance

The provided context does not include specific detection methods or commands for identifying the double free vulnerability in Windows DHCP Server (CVE-2026-50685). Detection typically involves checking for unusual network activity or using vulnerability scanning tools that can identify unpatched systems.

To detect if your system is vulnerable, you may consider the following general approaches:

• Use vulnerability scanning tools like Nessus, OpenVAS, or Microsoft Defender for Endpoint to scan for CVE-2026-50685.
• Check the installed version of the Windows DHCP Server and verify if it has been updated with the latest security patches from Microsoft.
• Monitor network traffic for unusual patterns that might indicate exploitation attempts, such as unexpected DHCP requests or responses.

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Impact Analysis

If you are using a Windows DHCP Server, this vulnerability could have several impacts:

• An authorized attacker could execute malicious code on the affected server, potentially gaining control over it.
• The attacker could disrupt network services, leading to downtime or loss of connectivity for users relying on the DHCP server.
• Sensitive data processed or stored by the server could be accessed, modified, or exfiltrated by the attacker.
• The attacker could use the compromised server as a pivot point to launch further attacks within the network.

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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 Windows DHCP Server processes or stores personal data of EU citizens, a successful exploit could lead to unauthorized access or disclosure of this data. This may violate GDPR requirements for data protection and breach notification.
• HIPAA: For organizations handling protected health information (PHI), exploitation of this vulnerability could result in unauthorized access to PHI, violating HIPAA's security and privacy rules.
• Other standards like 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.

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

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Mitigation Strategies

To mitigate the double free vulnerability in Windows DHCP Server (CVE-2026-50685), follow these immediate steps:

• Apply the latest security update provided by Microsoft for CVE-2026-50685. Refer to the Microsoft Security Update Guide for the specific patch.
• Restrict network access to the DHCP Server to trusted sources only, reducing the attack surface.
• Monitor the DHCP Server for any suspicious activity or unauthorized access attempts.
• Consider disabling the DHCP Server service if it is not essential for your network operations until the patch is applied.

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