CVE-2026-42909

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. 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
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

CVSS v3
7.5
EG Score
7.5(high)
EPSS
31.7%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 1, 2026

Advisory Details (1)

Auto-updated Jun 10, 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-2026-42909

Vendor Advisories for CVE-2026-42909(2)

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

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 38× in last 7d / 171× 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 171 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-42909?
CVE-2026-42909 is a high vulnerability published on June 9, 2026. Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
When was CVE-2026-42909 disclosed?
CVE-2026-42909 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on July 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42909 actively exploited?
CVE-2026-42909 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42909?
CVE-2026-42909 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-42909?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42909, 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

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