What is CVE-2026-34332?

CVE-2026-34332 is a high-severity vulnerability in Microsoft Windows Server 2025, classified under Use After Free. CVSS score: 8.0/10. Published 2026-05-12.

How severe is CVE-2026-34332?

High severity. CVSS v3 base score is 8.0 out of 10.

Use After Free in Microsoft Windows Server 2025

CVE-2026-34332

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

Vulnerability class: Use-After-Free

Published 2026-05-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (53.8th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003

Affected products

Microsoft Windows Server 2025 — versions 10.0.26100.0
Microsoft Windows Server 2025
Microsoft Windows Server 2025 (Server Core Installation) — versions 10.0.26100.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

Windows Kernel-Mode Driver Remote Code Execution Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34332?: CVE-2026-34332 is a high-severity vulnerability in Microsoft Windows Server 2025, classified under Use After Free. CVSS score: 8.0/10. Published 2026-05-12.
How severe is CVE-2026-34332?: High severity. CVSS v3 base score is 8.0 out of 10.