CVE-2026-83989

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. The CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.2%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Out-of-bounds read in Windows Services for NFS ONCRPC XDR Driver allows an unauthorized attacker to deny service over a network.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.2%
EPSS %ILE
66th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 8, 2026

Last Modified

October 1, 2026

Advisory Details (1)

Auto-updated Sep 8, 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-2026-83989

Vendor Advisories for CVE-2026-83989(2)

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 46× in last 7d / 203× 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 203 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-83989?
CVE-2026-83989 is a high vulnerability published on September 8, 2026. Out-of-bounds read in Windows Services for NFS ONCRPC XDR Driver allows an unauthorized attacker to deny service over a network.
When was CVE-2026-83989 disclosed?
CVE-2026-83989 was first published on September 8, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-83989 actively exploited?
CVE-2026-83989 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.2% probability of exploitation in the next 30 days (66th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-83989?
CVE-2026-83989 has a CVSS base score of 7.5 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-83989?
A fix for CVE-2026-83989 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-83989 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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