# CVE-2026-73010: Microsoft Windows Failover Cluster use-after-free code execution

Source: https://junglewise.ai/threats/cve-2026-73010-microsoft-windows-failover-cluster-use-after-free-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-73010 · Severity: critical · CVSS 9.8 · Published 2026-09-08

Windows Failover Cluster is a core component of Windows Server that enables high availability by allowing multiple servers to work together as a single cluster. A use-after-free vulnerability in this component allows an unauthenticated attacker to execute arbitrary code remotely across the network, potentially compromising the availability and security of critical server infrastructure.

Technologies: [Microsoft Windows Failover Cluster](https://junglewise.ai/threats/technologies/windows-failover-cluster). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-73010 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-73010 being exploited in the wild.

**How severe is CVE-2026-73010?** Critical severity, with a CVSS score of 9.8, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows Failover Cluster.

**Is there a fix for CVE-2026-73010?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-73010 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-73010?** Check whether you run Microsoft Windows Failover Cluster. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is a use-after-free memory corruption vulnerability in Windows Failover Cluster that allows network-based code execution without authentication. The vulnerability exists in memory management within the cluster service, allowing an attacker to craft a specially-formed network request that causes the service to access freed memory and execute attacker-controlled code. The flaw is exploitable over the network without requiring prior authentication or user interaction, making it a high-risk remote code execution vector for systems running Windows Failover Cluster.

## Affected products

- Microsoft Windows Failover Cluster

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-73010](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-73010)

## Related threats

- [Windows Failover Cluster use after free privilege escalation](https://junglewise.ai/threats/cve-2026-119869-use-after-free-in-windows-failover-cluster-allows-an-authorized)
- [Microsoft Windows Failover Cluster denial of service via uncaught exception](https://junglewise.ai/threats/cve-2026-96945-uncaught-exception-in-windows-failover-cluster-allows-an)
- [Microsoft Windows Failover Cluster use-after-free](https://junglewise.ai/threats/cve-2026-88102-use-after-free-in-windows-failover-cluster-allows-an-unauthorized)
- [Windows Failover Cluster uncaught exception denial of service](https://junglewise.ai/threats/cve-2026-88099-uncaught-exception-in-windows-failover-cluster-allows-an)
- [Windows Failover Cluster integer underflow denial of service](https://junglewise.ai/threats/cve-2026-102192-integer-underflow-wrap-or-wraparound-in-windows-failover-cluster)