CVE-2026-34332

Windows Kernel-Mode Driver Remote Code Execution Vulnerability

CVE-2026-34332 is fixed in 2 products on 1 platform, first by KB5087539, released May 12, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.0

Important

Exploitation

None reported

Exploitation Unlikely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0051

43rd percentile

<p>Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to execute code over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows Server 2025	26100.32860	KB5087539	May 12, 2026
Windows Server 2025	26100.32772	KB5087423	May 12, 2026
Windows Server 2025 (Server Core installation)	26100.32860	KB5087539	May 12, 2026
Windows Server 2025 (Server Core installation)	26100.32772	KB5087423	May 12, 2026

Details

Published
May 12, 2026
Weakness
Use After Free
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34332

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