CVE-2026-41089

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-12. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Elevated
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 80%
CISA-KEV: Not listedEPSS PROB: 80%CVSS: 9.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
91(Track)
EG Risk 91/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation80% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
80%
EPSS %ILE
100%
KEV
Not listed

Published

May 12, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated Aug 31, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41089

Vendor Advisories for CVE-2026-41089(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 4× in last 7d / 115× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 425 total refreshes for this CVE.

  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-01 13:53 UTCEPSS rescore
  3. 2026-08-30 19:17 UTCEPSS rescore
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-26 14:46 UTCEPSS rescore
  6. 2026-08-25 13:49 UTCEPSS rescore
  7. 2026-08-24 00:52 UTCVendor advisory
  8. 2026-08-24 00:52 UTCGHSA enrichment
  9. 2026-08-23 18:13 UTCEG score recompute
  10. 2026-08-23 18:13 UTCVendor advisory
  11. 2026-08-23 18:13 UTCGHSA enrichment
  12. 2026-08-20 22:55 UTCEPSS rescore
  13. 2026-08-19 17:03 UTCEPSS rescore
  14. 2026-08-17 14:42 UTCEG score recompute
  15. 2026-08-17 14:42 UTCVendor advisory
  16. 2026-08-17 14:42 UTCGHSA enrichment
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-17 10:50 UTCVendor advisory
  19. 2026-08-17 10:50 UTCGHSA enrichment
  20. 2026-08-16 11:55 UTCVendor advisory
  21. 2026-08-16 11:55 UTCGHSA enrichment
  22. 2026-08-16 08:04 UTCVendor advisory
  23. 2026-08-16 08:04 UTCGHSA enrichment
  24. 2026-08-16 04:13 UTCEG score recompute
  25. 2026-08-16 04:13 UTCVendor advisory
Show 75 more
  1. 2026-08-16 04:13 UTCGHSA enrichment
  2. 2026-08-16 02:14 UTCEPSS rescore
  3. 2026-08-15 01:46 UTCVendor advisory
  4. 2026-08-15 01:46 UTCGHSA enrichment
  5. 2026-08-14 21:55 UTCVendor advisory
  6. 2026-08-14 21:55 UTCGHSA enrichment
  7. 2026-08-14 18:05 UTCVendor advisory
  8. 2026-08-14 18:05 UTCGHSA enrichment
  9. 2026-08-14 14:14 UTCVendor advisory
  10. 2026-08-14 14:14 UTCGHSA enrichment
  11. 2026-08-14 10:23 UTCGHSA enrichment
  12. 2026-08-14 06:33 UTCVendor advisory
  13. 2026-08-14 06:33 UTCGHSA enrichment
  14. 2026-08-14 02:42 UTCEG score recompute
  15. 2026-08-14 02:42 UTCVendor advisory
  16. 2026-08-14 02:42 UTCGHSA enrichment
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-13 08:16 UTCVendor advisory
  19. 2026-08-13 08:16 UTCGHSA enrichment
  20. 2026-08-13 03:31 UTCGHSA enrichment
  21. 2026-08-12 23:41 UTCGHSA enrichment
  22. 2026-08-12 19:50 UTCVendor advisory
  23. 2026-08-12 19:50 UTCGHSA enrichment
  24. 2026-08-12 16:00 UTCEG score recompute
  25. 2026-08-12 16:00 UTCVendor advisory
  26. 2026-08-12 16:00 UTCGHSA enrichment
  27. 2026-08-12 13:51 UTCEPSS rescore
  28. 2026-08-11 23:20 UTCVendor advisory
  29. 2026-08-11 23:20 UTCGHSA enrichment
  30. 2026-08-11 19:30 UTCVendor advisory
  31. 2026-08-11 19:30 UTCGHSA enrichment
  32. 2026-08-11 15:40 UTCVendor advisory
  33. 2026-08-11 15:40 UTCGHSA enrichment
  34. 2026-08-11 08:44 UTCVendor advisory
  35. 2026-08-11 08:44 UTCGHSA enrichment
  36. 2026-08-11 04:53 UTCVendor advisory
  37. 2026-08-11 04:53 UTCGHSA enrichment
  38. 2026-08-11 01:03 UTCVendor advisory
  39. 2026-08-11 01:03 UTCGHSA enrichment
  40. 2026-08-10 15:27 UTCGHSA enrichment
  41. 2026-08-10 13:36 UTCVendor advisory
  42. 2026-08-10 13:36 UTCGHSA enrichment
  43. 2026-08-10 09:30 UTCGHSA enrichment
  44. 2026-08-10 05:40 UTCVendor advisory
  45. 2026-08-10 05:40 UTCGHSA enrichment
  46. 2026-08-10 01:49 UTCGHSA enrichment
  47. 2026-08-09 21:59 UTCVendor advisory
  48. 2026-08-09 21:59 UTCGHSA enrichment
  49. 2026-08-09 18:08 UTCGHSA enrichment
  50. 2026-08-09 14:18 UTCVendor advisory
  51. 2026-08-09 14:18 UTCGHSA enrichment
  52. 2026-08-09 10:27 UTCVendor advisory
  53. 2026-08-09 10:27 UTCGHSA enrichment
  54. 2026-08-09 05:54 UTCVendor advisory
  55. 2026-08-09 05:54 UTCGHSA enrichment
  56. 2026-08-09 02:04 UTCVendor advisory
  57. 2026-08-09 02:04 UTCGHSA enrichment
  58. 2026-08-08 14:10 UTCVendor advisory
  59. 2026-08-08 14:10 UTCGHSA enrichment
  60. 2026-08-08 10:17 UTCVendor advisory
  61. 2026-08-08 10:17 UTCGHSA enrichment
  62. 2026-08-08 06:26 UTCGHSA enrichment
  63. 2026-08-08 02:36 UTCVendor advisory
  64. 2026-08-08 02:36 UTCGHSA enrichment
  65. 2026-08-07 22:45 UTCGHSA enrichment
  66. 2026-08-07 18:55 UTCVendor advisory
  67. 2026-08-07 18:55 UTCGHSA enrichment
  68. 2026-08-07 15:04 UTCVendor advisory
  69. 2026-08-07 15:04 UTCGHSA enrichment
  70. 2026-08-07 11:14 UTCVendor advisory
  71. 2026-08-07 11:13 UTCGHSA enrichment
  72. 2026-08-07 07:13 UTCVendor advisory
  73. 2026-08-07 07:13 UTCGHSA enrichment
  74. 2026-08-07 01:28 UTCVendor advisory
  75. 2026-08-07 01:28 UTCGHSA enrichment

Publicly available exploits

(5 references)

Working exploit code is in the public domain (5 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCHydraSoft/CVE-2026-41089-Netlogon-RCE
    First seen Jul 21, 2026

    Technical analysis and Proof-of-Concept (PoC) for CVE-2026-41089, a critical unauthenticated Remote Code Execution (RCE) vulnerability in the Windows Netlogon service affecting Domain Controllers.

    Open source ↗
  • GitHub PoChnytgl/CVE-2026-41089
    First seen Jun 3, 2026

    CVE-2026-41089 - Windows Netlogon CLDAP Remote Code Execution Exploit (CVSS 9.8)

    Open source ↗
  • GitHub PoCADScanPro/CVE-2026-41089-LongLogon
    First seen Jun 3, 2026

    CVE-2026-41089 checker: unauthenticated, non-destructive detection for the Netlogon CLDAP stack buffer overflow (CVSS 9.8). Reports whether a domain controller's domain is long enough to crash, without sending the overflow. The binary-verified analysis the public PoCs got wrong.

    Open source ↗
  • GitHub PoC0xBlackash/CVE-2026-41089
    First seen Jun 2, 2026

    CVE-2026-41089

    Open source ↗
  • GitHub PoC0xABCD01/CVE-2026-41089
    First seen Jun 1, 2026

    CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-41089?
CVE-2026-41089 is a critical vulnerability published on May 12, 2026. Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
When was CVE-2026-41089 disclosed?
CVE-2026-41089 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41089 actively exploited?
CVE-2026-41089 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 80% probability of exploitation in the next 30 days, which ranks it in the top 0.4% of all scored CVEs.
What is the CVSS score of CVE-2026-41089?
CVE-2026-41089 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-41089?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41089, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-41089

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