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
88(Track)
EG Risk 88/100SSVC: 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%
Exploitation72% × 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

June 19, 2026

Advisory Details (1)

Auto-updated Jul 25, 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 8× in last 7d / 29× 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 286 total refreshes for this CVE.

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

Publicly available exploits

(4 references)

Working exploit code is in the public domain (4 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • 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 ↗

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 June 19, 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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