Microsoft Security Response CenterCVE-2026-69781

Windows DHCP Client Denial of Service Vulnerability

Severity not listedVendor CVSS 6.5 / 10 1 CVE Published Sep 8, 2026 at 7:00 AM UTC

Summary

Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over an adjacent network.

A separate affected-products list was not included in the collected bulletin.

Install KB5122871. Install KB5124008. Install KB5124012.

Update history

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

Oct 27, 2026 at 9:40 PM UTC
- Severity changed from High to Unknown.
- Removed affected products: Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for....
- Removed fixed versions: 10.0.26100.9445, 10.0.26100.33438, 10.0.26200.9445, 10.0.28000.2954.

Sep 8, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Sep 8, 2026 at 7:15 PM UTC
Added to SecurityAlert
We collected the advisory from the official source.
Oct 28, 2026 at 3:45 AM UTC
Confirmed at the source
Our collector saw this advisory during a later source check.

Details collected from Microsoft Security Response Center.

Official bulletin How SecurityAlert builds this record

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