Quick answers
- Is CVE-2026-72989 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-72989 being exploited in the wild.
- How severe is CVE-2026-72989?
- High severity, with a CVSS score of 7.5, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Windows Failover Cluster.
- Is there a fix for CVE-2026-72989?
- 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-2026-72989 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-72989?
- 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
A use-of-uninitialized-resource vulnerability exists in Windows Failover Cluster where memory buffers are not properly initialized before being transmitted or exposed over the network. The vulnerability is network-reachable and does not require authentication or user interaction. An attacker can send crafted network requests to trigger the uninitialized memory disclosure, leaking sensitive information that may include cluster configuration, authentication tokens, or other protected data. Microsoft has released patches to address this issue.
Affected products
- Microsoft Windows Failover Cluster
Timeline
- 2026-09-08: disclosed