CVE-2026-42911

HIGHPre-NVD 7.07.0—
EchelonGraph scoreMEDIUM 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
7.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.0Exploit: None knownExposed: 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(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity70% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

June 9, 2026

Last Modified

August 25, 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 9× in last 7d / 55× 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 352 total refreshes for this CVE.

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

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 August 25, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 85.6% of all scored CVEs.
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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