CVE tracker / CVE-2026-34332
CVE-2026-34332
CVE-2026-34332 is the Windows Kernel-Mode Driver Remote Code Execution Vulnerability. Microsoft rates it Important, CVSS 8.0. It is not in CISA's Known Exploited Vulnerabilities catalog. Published May 12, 2026.
Risk summary
HighRemote Code Execution
8.0
CVSS v3 base
0.5%
EPSS: chance of exploitation in 30 days
High
Severity
Important
Microsoft's rating
Unlikely
Microsoft: exploitation
No
In CISA KEV
Microsoft describes it: “Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to execute code over a network.”
How to fix it
Microsoft lists 2 affected products and the update that fixes each:
- KB5087539 · fixed build 10.0.26100.32860
Windows Server 2025, Windows Server 2025 (Server Core installation)
What Microsoft changed
- May 12, 2026: Information published.
Details
- Weakness
- CWE-416: Use After Free
- Publicly disclosed (Microsoft)
- No
- Exploited (Microsoft)
- No
- Known exploited (CISA KEV)
- Not listed
- Published
- May 12, 2026
- Last revised
- May 12, 2026
Get told when this changes
Senserva Watch emails Microsoft security and patch alerts when something moves: a new exploitation report, a revised fix, a known issue. Free, one email address.
References
From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.