What is CVE-2026-34350?

CVE-2026-34350 is a medium-severity vulnerability in Microsoft Windows Server 2025, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-05-12.

How severe is CVE-2026-34350?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Microsoft Windows Server 2025

CVE-2026-34350

Null pointer dereference in Windows Storport Miniport Driver allows an unauthorized attacker to deny service over a network.

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.001

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-476 — NULL Pointer Dereference

References

Windows Storport Miniport Driver Denial of Service Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34350?: CVE-2026-34350 is a medium-severity vulnerability in Microsoft Windows Server 2025, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-05-12.
How severe is CVE-2026-34350?: Medium severity. CVSS v3 base score is 6.5 out of 10.