CVE-2026-41089
published 2026-05-12CVE-2026-41089: Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
PriorityP195critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
ITWEXPLOITVulnCheck KEVInitial access
Exploited in the wild
EPSS
79.62%
99.6th percentile
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_server_2012 | — | — |
| microsoft | windows_server_2012 | >= 6.2.9200.0 < 6.2.9200.26079 | 6.2.9200.26079 |
| microsoft | windows_server_2012_r2 | >= 6.3.9600.0 < 6.3.9600.23181 | 6.3.9600.23181 |
| microsoft | windows_server_2016 | < 10.0.14393.9140 | 10.0.14393.9140 |
| microsoft | windows_server_2016 | >= 10.0.14393.0 < 10.0.14393.9140 | 10.0.14393.9140 |
| microsoft | windows_server_2019 | < 10.0.17763.8755 | 10.0.17763.8755 |
| microsoft | windows_server_2019 | >= 10.0.17763.0 < 10.0.17763.8755 | 10.0.17763.8755 |
| 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 |
| microsoft | windows_server_2022_23h2 | < 10.0.25398.2330 | 10.0.25398.2330 |
| microsoft | windows_server_2025 | < 10.0.26100.32772 | 10.0.26100.32772 |
| microsoft | windows_server_2025 | >= 10.0.26100.0 < 10.0.26100.32860 | 10.0.26100.32860 |
Detection & IOCsextracted from sources · hover to see the quote
snort↗
Microsoft Windows Netlogon Remote Code Execution (CVE-2026-41089)
- →CVE-2026-41089 is actively exploited in the wild against Windows Server domain controllers; prioritize detection and patching of all Windows Server versions from 2012 onwards, including Windows Server 2025. ↗
- →Successful exploitation of CVE-2026-41089 may result in SYSTEM-level control of domain controllers; alert on unexpected SYSTEM-level process creation originating from the Netlogon service. ↗
- ·All currently supported Windows Server versions are affected, including the latest release; patches are available for Windows Server 2012 and later. ↗
- ·No further technical details on observed in-the-wild attack chains have been publicly disclosed by the reporting authority (CCB) as of the time of reporting. ↗
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vulncheck9.8CRITICAL
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GHSA
GHSA-7j2c-v44v-wc8f: Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network
ghsa_unreviewed·2026-05-12
CVE-2026-41089 [CRITICAL] CWE-121 GHSA-7j2c-v44v-wc8f: Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
VulDB
Microsoft Windows Server 2012 up to Server 2022 23H2 Netlogon stack-based overflow
vuldb·2026-05-12
CVE-2026-41089 Microsoft Windows Server 2012 up to Server 2022 23H2 Netlogon stack-based overflow
A vulnerability categorized as very critical has been discovered in Microsoft Windows Server 2012 up to Server 2022 23H2. Affected by this issue is some unknown functionality of the component Netlogon. The manipulation results in stack-based buffer overflow.
This vulnerability is known as CVE-2026-41089. It is possible to launch the attack remotely. No exploit is available.
It is advisable to upgrade the affected component.
VulnCheck
Microsoft Windows Stack-based Buffer Overflow
vulncheck·2026·CVSS 9.8
CVE-2026-41089 [CRITICAL] Microsoft Windows Stack-based Buffer Overflow
Microsoft Windows Stack-based Buffer Overflow
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
Affected: Microsoft Windows
Required Action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Exploitation References: https://ccb.belgium.be/advisories/warning-microsoft-patch-tuesday-may-2026-patches-118-vulnerabilities-16-critical-102#:~:text=It%20is%20now%20actively%20exploited%20in%20the%20wild
No detection rules found.
No public exploits indexed.
Checkpoint
8th June – Threat Intelligence Report
blogs_checkpoint·2026-06-08
CVE-2025-48595 8th June – Threat Intelligence Report
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## 8th June – Threat Intelligence Report
For the latest discoveries in cyber research for the week of 1st June, please download our Threat Intelligence Bulletin.
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Bleepingcomputer
Critical Windows Netlogon RCE flaw now exploited in attacks
blogs_bleepingcomputer·2026-06-01·CVSS 7.8
CVE-2026-41089 [HIGH] Critical Windows Netlogon RCE flaw now exploited in attacks
## Critical Windows Netlogon RCE flaw now exploited in attacks
## Sergiu Gatlan
"An attacker could send a specially crafted network request to a Windows server that is acting as a domain controller," it said. "If successful, this could cause the Netlogon service to improperly handle the request, potentially allowing the attacker to run code on the affected system without needing to sign in or have prior access."
CVE-2026-41089 impacts all currently supported Windows Server versions, including the latest release, Windows Server 2025.
According to a security advisory published by the company on May 12, the vulnerability was discovered by Windows Attack Research & Protection (WARP), an internal offensive cybersecurity and engineering research team at Microsoft.
On Friday, Belgium's natio
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## ⚡ Weekly Recap: New Linux Flaw, PAN-OS Exploit, AI-Powered Attacks, OAuth Phishing and More
Monday hit like a cron job with anger issues.
A busted auth path here, a repo-side faceplant there, some "patched-ish" thing already getting chewed on in the wild, and then the usual bonus round: poisoned dev tools, sketchy forum chatter, phishing kits pretending to be productivity, and AI lowering the bar for people who already thought 'curl | sh' had a personality.
The vibe is simple: old bugs, new wrappers, faster abuse. Patch the obvious crap first. Then read the rest.
## ⚡ Threat of the Week
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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
Talos
Microsoft Patch Tuesday for May 2026 — Snort rules and prominent vulnerabilities
blogs_talos·2026-05-12·CVSS 7.5
CVE-2026-32161 [HIGH] Microsoft Patch Tuesday for May 2026 — Snort rules and prominent vulnerabilities
## Microsoft Patch Tuesday for May 2026 — Snort rules and prominent vulnerabilities
By Jaeson Schultz
Microsoft has released its monthly security update for May 2026, which includes 137 vulnerabilities affecting a range of products, including 31 that Microsoft marked as “critical”.
In this month's release, Microsoft has not observed any of the included vulnerabilities being actively exploited in the wild. Out of 31 "critical" entries, 16 are remote code execution (RCE) vulnerabilities in Microsoft Windows services and applications including Microsoft Office, Microsoft Word, Windows Native WiFi Miniport Driver, Azure, Office for Android, Microsoft Dynamics 365, Windows GDI, Microsoft SharePoint, Windows Graphics Component, Windows Netlogon, and Windows DNS Client.
CVE-2026-32161 is a cr
Krebs
Patch Tuesday, May 2026 Edition
blogs_krebs·2026-05-12·CVSS 9.8
CVE-2026-41089 [CRITICAL] Patch Tuesday, May 2026 Edition
Artificial intelligence platforms may be just as susceptible to social engineering as human beings, but they are proving remarkably good at finding security vulnerabilities in human-made computer code. That reality is on full display this month with some of the more widely-used software makers — including Apple , Google , Microsoft , Mozilla and Oracle — fixing near record volumes of security bugs, and/or quickening the tempo of their patch releases.
As it does on the second Tuesday of every month, Microsoft today released software updates to address at least 118 security vulnerabilities in its various Windows operating systems and other products. Remarkably, this is the first Patch Tuesday in nearly two years that Microsoft is not shipping any fixes to deal with emergency zero-day flaws
Tenable
Microsoft’s May 2026 Patch Tuesday Addresses 118 CVEs (CVE-2026-41103)
blogs_tenable·2026-05-12·CVSS 9.1
CVE-2026-41103 [CRITICAL] Microsoft’s May 2026 Patch Tuesday Addresses 118 CVEs (CVE-2026-41103)
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## Accelerate your exposure management strategy with practical resources and tools.
## Microsoft’s May 2026 Patch Tuesday Addresses 118 CVEs (CVE-2026-41103)
16 Critical
102 Important
0 Moderate
0 Low
Microsoft addresses 118 CVEs in its May 2026 Patch Tuesday release, with no zero-days exploited in the wild or publicly disclosed for the first time since June 2024.
Microsoft p
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
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2026-05-12
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Exploited in the wild