CVE-2026-102192: Windows Failover Cluster Denial of Service Vulnerability
Integer underflow (wrap or wraparound) in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.
Other sources
Windows Failover Cluster Denial of Service Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
The affected software listed is Microsoft Windows Server 2019, Windows Server 2022, and Windows Server 2025. Exposure is limited to systems using the Windows Failover Cluster component.
Does exploitation require credentials or user interaction?
No. The supplied vector indicates network-based exploitation with low attack complexity, no privileges required, and no user interaction required.
What impact should responders expect from successful exploitation?
Successful exploitation can deny service through Windows Failover Cluster. The provided impact data indicates availability impact only, with no stated confidentiality or integrity impact.