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Windows Netlogon stack-based buffer overflow security flaw (CVE-2026-41089)

Vulnerability
First reported
Last updated
Happening score
H score 37
2 unique sources, 2 articles

Summary

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Microsoft’s May Patch Tuesday fixed CVE-2026-41089, a critical stack-based buffer overflow in Windows Netlogon that could let attackers gain system privileges on a domain controller. The flaw has a CVSS v3 score of 9.8, requires no privileges or user interaction, and is rated low complexity. Security teams responsible for domain controllers should prioritize remediation.

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Microsoft Defender BlueHammer (CVE-2026-33825) ransomware exploitation wave

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Open Happening

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Public Sector Action
H score48 First: 01.06.2026 15:30 Last: 01.06.2026 15:30 Sources 1

How related: "On Friday, Belgium's national cybersecurity authority (CCB) warned that attackers are now actively exploiting the CVE-2026-41089 security flaw in the wild and urged admins to immediately patch vulnerable servers."

About this happening: Belgium's CCB warned that CVE-2026-41089 is being actively exploited in the wild, urging admins to immediately patch vulnerable Windows servers because the fla...

Open Happening

Microsoft Windows Server 2016 domain controller discovery failure after KB5087537

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Open Happening

Microsoft Defender zero-days exploited in attacks (multiple vulnerabilities)

Vulnerability
H score39 First: 21.05.2026 10:49 Last: 21.05.2026 10:49 Sources 1

About this happening: Microsoft began rolling out fixes for CVE-2026-41091 and CVE-2026-45498, two actively exploited zero-days in Microsoft Defender components that affect unpatched Wi...

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Timeline

  1. 13.05.2026 11:15 3 articles · 2mo ago

    Microsoft fixes CVE-2026-41089 in Windows Netlogon

    Initial Disclosure

    Microsoft published May Patch Tuesday security updates that fixed 120 CVEs, including CVE-2026-41089 in Windows Netlogon, a critical stack-based buffer overflow with a CVSS v3 base score of 9.8 that could give attackers system privileges on a domain controller. Rapid7 principal software engineer Adam Barnett urged anyone responsible for securing a domain controller to prioritize remediation, noting that no privileges or user interaction are required and attack complexity is low.

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