What is CVE-2026-41089?
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
The record classifies CVE-2026-41089 under weakness class CWE-121. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 10 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 169 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - EPSS (FIRST)
- 0.9% probability of exploitation in the next 30 days, higher than 60.9% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 9.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-05-12, last modified 2026-08-10
Is CVE-2026-41089 being exploited?
Weaponised exploit code for CVE-2026-41089 is publicly available. 10 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 28 in the Threadlinqs vulnerability feed.
- 0xABCD01/CVE-2026-41089 (github)
- SyntaxMethod/CVE-2026-41089-Netlogon-RCE-PoC (github)
- HydraSoft/CVE-2026-41089-Netlogon-RCE (github)
- ADScanPro/CVE-2026-41089-LongLogon (github)
- hnytgl/CVE-2026-41089 (github)
- 0xBlackash/CVE-2026-41089 (github)
- ZeroDayVPN/CVE-2026-41089-Netlogon (github)
- opensource-arrozconpollo191/CVE-2026-41089-Netlogon-RCE (github)
Affected products and versions
- Microsoft: Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022, 23H2 Edition (Server Core installation)
How to fix CVE-2026-41089
No vendor patch reference has been recorded for CVE-2026-41089 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-41089
3 tracked threats in the Threadlinqs corpus reference CVE-2026-41089, either in the campaign’s CVE list or as an indicator on the campaign record.
- Microsoft's MDASH AI Scanning Harness Uncovers 16 Windows CVEs, Including Four Critical RCE Flaws in TCP/IP, IKEv2, Netlogon, and DNS — CRITICAL · 2026-07-10
- Windows Netlogon 0-Click RCE CVE-2026-41089 — Active Exploitation in the Wild (Domain Controller Takeover) — CRITICAL · 2026-06-01
- Microsoft May 2026 Patch Tuesday — 137 CVEs, 31 Critical (16 RCE) Including CVE-2026-41089 Pre-Auth Netlogon Stack Overflow on Domain Controllers — HIGH · 2026-05-12
Sources
Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .