CVE-2026-42911

HIGHPre-NVD 7.07.0—
EchelonGraph scoreHIGH confidence

Score 7.0 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. the CNA's CVSS baseline 7.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
7.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.0Exploit: NoneExposed: 0

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

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVSS v3
7.0
EG Score
7.0(high)
EPSS
14.2%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 1, 2026

Advisory Details (1)

Auto-updated Jun 11, 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-2026-42911

Vendor Advisories for CVE-2026-42911(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 41× in last 7d / 179× 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 179 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. 2026-07-06 02:17 UTCEG score recompute
  6. 2026-07-06 02:17 UTCVendor advisory
  7. 2026-07-06 02:16 UTCGHSA enrichment
  8. 2026-07-05 14:25 UTCEG score recompute
  9. 2026-07-05 14:25 UTCVendor advisory
  10. 2026-07-05 14:25 UTCGHSA enrichment
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-05 02:20 UTCEG score recompute
  13. 2026-07-05 02:20 UTCVendor advisory
  14. 2026-07-05 02:20 UTCGHSA enrichment
  15. 2026-07-04 13:30 UTCEG score recompute
  16. 2026-07-04 13:30 UTCVendor advisory
  17. 2026-07-04 13:30 UTCGHSA enrichment
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-03 15:37 UTCEG score recompute
  20. 2026-07-03 15:37 UTCVendor advisory
  21. 2026-07-03 15:37 UTCGHSA enrichment
  22. 2026-07-03 02:50 UTCEG score recompute
  23. 2026-07-03 02:50 UTCVendor advisory
  24. 2026-07-03 02:49 UTCGHSA enrichment
  25. 2026-07-02 14:50 UTCEG score recompute
Show 75 more
  1. 2026-07-02 14:50 UTCVendor advisory
  2. 2026-07-02 14:50 UTCGHSA enrichment
  3. 2026-07-02 02:58 UTCEG score recompute
  4. 2026-07-02 02:58 UTCVendor advisory
  5. 2026-07-02 02:58 UTCGHSA enrichment
  6. 2026-07-01 15:07 UTCEG score recompute
  7. 2026-07-01 15:07 UTCVendor advisory
  8. 2026-07-01 15:07 UTCGHSA enrichment
  9. 2026-07-01 15:06 UTCEPSS rescore
  10. 2026-07-01 03:10 UTCEG score recompute
  11. 2026-07-01 03:10 UTCVendor advisory
  12. 2026-07-01 03:10 UTCGHSA enrichment
  13. 2026-06-30 23:22 UTCEPSS rescore
  14. 2026-06-30 15:19 UTCEG score recompute
  15. 2026-06-30 15:19 UTCVendor advisory
  16. 2026-06-30 15:19 UTCGHSA enrichment
  17. 2026-06-30 00:08 UTCEG score recompute
  18. 2026-06-30 00:08 UTCVendor advisory
  19. 2026-06-30 00:08 UTCGHSA enrichment
  20. 2026-06-29 14:06 UTCEPSS rescore
  21. 2026-06-29 12:12 UTCEG score recompute
  22. 2026-06-29 12:12 UTCVendor advisory
  23. 2026-06-29 12:12 UTCGHSA enrichment
  24. 2026-06-29 00:19 UTCEG score recompute
  25. 2026-06-29 00:19 UTCVendor advisory
  26. 2026-06-29 00:19 UTCGHSA enrichment
  27. 2026-06-28 14:07 UTCEPSS rescore
  28. 2026-06-28 12:27 UTCEG score recompute
  29. 2026-06-28 12:27 UTCVendor advisory
  30. 2026-06-28 12:27 UTCGHSA enrichment
  31. 2026-06-28 04:56 UTCEPSS rescore
  32. 2026-06-28 00:33 UTCEG score recompute
  33. 2026-06-28 00:33 UTCVendor advisory
  34. 2026-06-28 00:33 UTCGHSA enrichment
  35. 2026-06-27 12:42 UTCEG score recompute
  36. 2026-06-27 12:42 UTCVendor advisory
  37. 2026-06-27 12:42 UTCGHSA enrichment
  38. 2026-06-27 03:08 UTCEPSS rescore
  39. 2026-06-27 00:50 UTCEG score recompute
  40. 2026-06-27 00:50 UTCVendor advisory
  41. 2026-06-27 00:50 UTCGHSA enrichment
  42. 2026-06-26 12:34 UTCEG score recompute
  43. 2026-06-26 12:34 UTCVendor advisory
  44. 2026-06-26 12:34 UTCGHSA enrichment
  45. 2026-06-25 22:48 UTCEG score recompute
  46. 2026-06-25 22:48 UTCVendor advisory
  47. 2026-06-25 22:48 UTCGHSA enrichment
  48. 2026-06-25 13:49 UTCEPSS rescore
  49. 2026-06-25 13:49 UTCEPSS rescore
  50. 2026-06-25 10:57 UTCEG score recompute
  51. 2026-06-25 10:57 UTCVendor advisory
  52. 2026-06-25 10:56 UTCGHSA enrichment
  53. 2026-06-24 23:04 UTCEG score recompute
  54. 2026-06-24 23:04 UTCVendor advisory
  55. 2026-06-24 23:04 UTCGHSA enrichment
  56. 2026-06-24 14:05 UTCEPSS rescore
  57. 2026-06-24 11:13 UTCEG score recompute
  58. 2026-06-24 11:13 UTCVendor advisory
  59. 2026-06-24 11:13 UTCGHSA enrichment
  60. 2026-06-23 22:38 UTCEG score recompute
  61. 2026-06-23 22:38 UTCVendor advisory
  62. 2026-06-23 22:38 UTCGHSA enrichment
  63. 2026-06-23 21:33 UTCEPSS rescore
  64. 2026-06-23 10:06 UTCEG score recompute
  65. 2026-06-23 10:06 UTCVendor advisory
  66. 2026-06-23 10:06 UTCGHSA enrichment
  67. 2026-06-22 21:56 UTCEG score recompute
  68. 2026-06-22 21:56 UTCVendor advisory
  69. 2026-06-22 21:56 UTCGHSA enrichment
  70. 2026-06-22 14:25 UTCEPSS rescore
  71. 2026-06-22 14:25 UTCEPSS rescore
  72. 2026-06-22 04:58 UTCEG score recompute
  73. 2026-06-22 04:58 UTCVendor advisory
  74. 2026-06-22 04:58 UTCGHSA enrichment
  75. 2026-06-21 14:56 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-42911?
CVE-2026-42911 is a high vulnerability published on June 9, 2026. Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
When was CVE-2026-42911 disclosed?
CVE-2026-42911 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-2026-42911 actively exploited?
CVE-2026-42911 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 14.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42911?
CVE-2026-42911 has a CVSS v4.0 base score of 7.0 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-42911?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42911, 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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