PT-2026-40152 · Microsoft · Windows Server 2025+1

Published 2026-05-12 · Updated 2026-05-15 · CVE-2026-34332

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Windows Server 2025 (affected versions not specified)

Description A use after free issue in Windows Kernel-Mode Drivers allows an authorized attacker to execute code over a network. This occurs via NVMe-oF (NVMe over Fabrics), a network protocol that allows NVMe storage commands to be transferred over a network fabric.

Recommendations Apply the available hotpatch or patch for Windows Server 2025.

Fix

RCE

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-06862

CVE-2026-34332

Affected Products

Windows

Windows Server 2025

References · 7

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-34332 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-34332 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06862 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34332 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-34332 · Security Note
• https://twitter.com/f1tym1/status/2055186297094893597 · Twitter Post
• https://twitter.com/windowsforum/status/2054306165861798200 · Twitter Post