Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS
CVE-2026-72998 Overview
Use after free in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
Critical Impact
Affected Products
- Microsoft Windows DHCP Server: see the vendor advisory for the exact affected versions
Discovery Timeline
- 2026-11-10: CVE-2026-72998 published to the National Vulnerability Database by secure@microsoft.com
- 2026-11-10: last updated in the NVD database
Technical Details for CVE-2026-72998
Vulnerability Analysis
CVE-2026-72998 is a Use After Free weakness (CWE-416: Use After Free) in Microsoft Windows DHCP Server. Based on its CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. Memory is used after it was released, which can lead to code execution.
With a CVSS base score of 8.1, apply the vendor fix and confirm exposure on internet facing and business critical assets first.
Root Cause
The weakness is classified as CWE-416: Use After Free. Memory is used after it was released, which can lead to code execution.
Attack Vector
Based on the CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. Attack complexity is high complexity.
No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Detection Methods for CVE-2026-72998
Detection Strategies
- Inventory every instance of Microsoft Windows DHCP Server and compare the running version with the affected range above.
- Check external attack surface scans for internet facing instances of the component.
- Run an authenticated vulnerability scan once your scanner ships a check for this CVE.
Monitoring Recommendations
- Forward Microsoft Windows DHCP Server application, access and audit logs to your SIEM for retrospective hunting.
- Alert on new processes, configuration changes or outbound connections from the affected service.
- Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.
How to Mitigate CVE-2026-72998
Immediate Actions Required
- Apply the fixed version of Microsoft Windows DHCP Server named in the vendor advisory.
- Prioritize internet facing and business critical instances first.
- Rescan after the change to confirm the exposure is closed.
Patch Information
Use the fixed version listed in the vendor advisory for Microsoft Windows DHCP Server.
Workarounds
- If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.
CWE References
- CWE-416: Use After Free More CVEs with this weakness
Technical References
This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.
Frequently asked questions
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