CVE-2026-40402
published 2026-05-12CVE-2026-40402: Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
PriorityP352critical9.3CVSS 3.1
AVLACLPRNUINSCCHIHAH
EPSS
0.33%
25.4th percentile
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_11_23h2 | < 10.0.22631.7079 | 10.0.22631.7079 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.7079 | 10.0.22631.7079 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.7219 | 10.0.22631.7219 |
| microsoft | windows_server_2022 | < 10.0.20348.5074 | 10.0.20348.5074 |
| microsoft | windows_server_2022 | >= 10.0.20348.0 < 10.0.20348.5139 | 10.0.20348.5139 |
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GHSA
GHSA-h659-hh52-mv97: Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally
ghsa_unreviewed·2026-05-12
CVE-2026-40402 [CRITICAL] CWE-416 GHSA-h659-hh52-mv97: Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
VulDB
Microsoft Windows 11 23H2/Server 2022 Hyper-V use after free
vuldb·2026-05-12
CVE-2026-40402 [CRITICAL] Microsoft Windows 11 23H2/Server 2022 Hyper-V use after free
A vulnerability was found in Microsoft Windows 11 23H2/Server 2022. It has been classified as critical. The affected element is an unknown function of the component Hyper-V. This manipulation causes use after free.
This vulnerability appears as CVE-2026-40402. The attack requires local access. There is no available exploit.
Upgrading the affected component is recommended.
No detection rules found.
No public exploits indexed.
Rapid7
Patch Tuesday - May 2026
blogs_rapid7·2026-05-13·CVSS 10.0
CVE-2026-41089 [CRITICAL] Patch Tuesday - May 2026
Microsoft is publishing 137 vulnerabilities on May 2026 Patch Tuesday . Microsoft is not aware of exploitation in the wild or public disclosure for any of these vulnerabilities. So far this month, Microsoft has provided patches to address 133 browser vulnerabilities, which are not included in the Patch Tuesday count above.
## Windows Netlogon: critical RCE
Anyone responsible for securing a domain controller should prioritize remediation of CVE-2026-41089 , which is a critical stack-based buffer overflow in Windows Netlogon with a CVSS v3 base score of 9.8. Exploitation leads to execution in the context of the Netlogon service, so that’s SYSTEM privileges on the domain controller. For most pentesters, that’s the point at which the customer report more or less writes itself. No privileges
Hackernews
Microsoft Patches 138 Vulnerabilities, Including DNS and Netlogon RCE Flaws
blogs_hackernews·2026-05-13·CVSS 9.8
CVE-2025-54518 [CRITICAL] Microsoft Patches 138 Vulnerabilities, Including DNS and Netlogon RCE Flaws
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## Microsoft Patches 138 Vulnerabilities, Including DNS and Netlogon RCE Flaws
Microsoft on Tuesday released patches for 138 security vulnerabilities spanning its product portfolio, although none of them have been listed as publicly known or under active attack.
Of the 138 flaws, 30 are rated Critical, 104 are rated Important, three are rated Moderate, and one is rated Low in severity. As many as 61 vulnerabilities are classified as privilege escalation bugs, followed by 32 remote code execution, 15 information disclosure, 14 spoofing, eight denial-of-service, six security feature bypass, and two tampering flaws.
The update li
Qualys
Microsoft and Adobe Patch Tuesday, May 2026 Security Update Review
blogs_qualys·2026-05-12
CVE-2026-40364 Microsoft and Adobe Patch Tuesday, May 2026 Security Update Review
## Table of Contents
Microsoft Patch Tuesday forMay2026
Adobe Patches for May 2026
Critical Severity Vulnerabilities Patched inMayPatch Tuesday Edition
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Qualys Monthly Webinar Series
May 2026’s Patch Tuesday arrives with Microsoft addressing a fresh set of vulnerabilities across its ecosystem, reinforcing the ongoing need for timely patching in an increasingly threat-heavy landscape. Here’s a quick breakdown of what you need to know.
## Microsoft Patch Tuesday for May 2026
This month’s release addresses 137 vulnerabilities, including 30 critical and 103 important-severity vulnerabilities.
In this month’s updates, Microsoft has not addressed any publicly disclosed zero-day vulnerability.
Microsoft has addressed 128
Sans Isc
Microsoft May 2026 Patch Tuesday, (Tue, May 12th)
blogs_sans_isc·2026-05-12·CVSS 4.3
CVE-2026-41103 [MEDIUM] Microsoft May 2026 Patch Tuesday, (Tue, May 12th)
Microsoft May 2026 Patch Tuesday
Published: 2026-05-12. Last Updated: 2026-05-12 18:29:36 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
Today's Microsoft patch Tuesday fixes 137 different vulnerabilities. In addition, the update addresses 137 Chromium-related issues affecting Microsoft Edge.
There are no already disclosed or already exploited vulnerabilities included in today's patches. I removed the Chromium issues from the table below and included only the 137 Microsoft issues to make it more readable.
Note that issues related to Microsoft Azure are labeled as "no customer action required.
Significant Vulnerabilities of interest:
CVE-2026-41103: This vulnerability affects the Microsoft SSO Plugin for Jira & Confluence. Exploitation could lead to an elevation of privileges. Wit
Crowdstrike
May 2026 Patch Tuesday: 30 Critical Vulnerabilities Among 130 CVEs
blogs_crowdstrike
CVE-2026-20929 May 2026 Patch Tuesday: 30 Critical Vulnerabilities Among 130 CVEs
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May 2026 Patch Tuesday: 30 Critical Vulnerabilities Among 130 CVEs May 12, 2026
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CrowdStrike Named a Leader in the First-Ever Gartner® Magic Quadrant™ for Cyberthreat Intelligence Technologies May 06, 2026
Falcon AIDR Detects Threats at the Prompt Layer in Kubernetes AI Applications May 13, 2026
May 2026 Patch Tuesday: 30 Critical Vulnerabilities Among 130 CVEs May 12, 2026
Inside CrowdStrike Automated Leads: A Transformative Approach to Threat Detections May 11, 2026
CrowdStrike Named a Leader in the First-Ever Gartner® Magic Quadrant™ for Cyberthreat Intelligence Technologies May 06, 2026
Video Hi
2026-05-12
Published