Use of uninitialized resource in Microsoft Windows and Windows Server - CVE-2026-72989
Published: September 9, 2026
Vulnerability identifier: #VU148133
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-72989
CWE-ID: CWE-908
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to use of an uninitialized resource in Windows Failover Cluster when accessed over a network. A remote attacker can access the vulnerable component over a network to disclose sensitive information.
Disclosed information may include uninitialized stack memory.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-72989
Install security update from vendor's website.
Microsoft Windows - update to 10 1809 10.0.17763.9245
Windows Server - addressed in versions 2019 10.0.17763.9245, 2022 10.0.20348.5622, 2025 10.0.26100.33438
Windows Server - addressed in versions 2019 10.0.17763.9245, 2022 10.0.20348.5622, 2025 10.0.26100.33438