CVE-2026-96945: Windows Failover Cluster Denial of Service Vulnerability
Published Oct 13, 2026
·Updated
Uncaught exception 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
7 affected componentsFixes available
Microsoft Windows Failover Cluster
Microsoft Windows Server 2025<10.0.26100.33650
10.0.26100.33650
Microsoft Windows Server 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows Server 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows Server 2025<10.0.26100.33650
10.0.26100.33650
Microsoft Windows Server 2019<10.0.17763.9376
10.0.17763.9376
Microsoft Windows Server 2019<10.0.17763.9376
10.0.17763.9376
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
Oct 13, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·07:01 PM
Data Sourced
via MITRE·07:01 PM
DescriptionSeverity
Frequently Asked Questions
1
Does an attacker need credentials or user interaction to exploit this issue?
No. The CVSS vector indicates no privileges are required and no user interaction is required; exploitation is possible over a network.
2
Does this vulnerability affect data confidentiality or integrity?
The CVSS vector indicates no confidentiality or integrity impact. Its impact is limited to availability, with a high availability impact rating.