CVE-2026-65791

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-11. The CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Heap-based buffer overflow in Windows iSCSI Target Service allows an unauthorized attacker to execute code over a network.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100CISA 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
Severity98% × 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
1.0%
EPSS %ILE
60th
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 total (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

August 11, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Sep 29, 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-2026-65791

Vendor Advisories for CVE-2026-65791(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 50× in last 7d / 293× 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 686 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-65791?
CVE-2026-65791 is a critical vulnerability published on August 11, 2026. Heap-based buffer overflow in Windows iSCSI Target Service allows an unauthorized attacker to execute code over a network.
When was CVE-2026-65791 disclosed?
CVE-2026-65791 was first published on August 11, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-65791 actively exploited?
CVE-2026-65791 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (60th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-65791?
CVE-2026-65791 has a CVSS base score of 9.8 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-65791?
A fix for CVE-2026-65791 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-65791 are linked in the Vendor Advisories panel on this page.

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