# CVE-2026-102192: Windows Failover Cluster Denial of Service Vulnerability

CVE-2026-102192 is fixed in 6 products on 1 platform, first by KB5126651, released October 13, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-102192
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0127
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Oct 13, 2026
- Weakness: Integer Underflow (Wrap or Wraparound)
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102192

## Description

<p>Integer underflow (wrap or wraparound) in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows Server 2019 | 17763.9376 | [KB5126651](https://patchblox.com/security/data/fix/microsoft/kb5126651.md) | Oct 13, 2026 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.9376 | [KB5126651](https://patchblox.com/security/data/fix/microsoft/kb5126651.md) | Oct 13, 2026 |
| Microsoft | Windows Server 2022 | 20348.5761 | [KB5126655](https://patchblox.com/security/data/fix/microsoft/kb5126655.md) | Oct 13, 2026 |
| Microsoft | Windows Server 2022 (Server Core installation) | 20348.5761 | [KB5126655](https://patchblox.com/security/data/fix/microsoft/kb5126655.md) | Oct 13, 2026 |
| Microsoft | Windows Server 2025 | 26100.33650 | [KB5126646](https://patchblox.com/security/data/fix/microsoft/kb5126646.md) | Oct 13, 2026 |
| Microsoft | Windows Server 2025 (Server Core installation) | 26100.33650 | [KB5126646](https://patchblox.com/security/data/fix/microsoft/kb5126646.md) | Oct 13, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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