CVE-2026-34344

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-12. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

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

Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
23.4%
KEV
Not listed

Published

May 12, 2026

Last Modified

June 19, 2026

Advisory Details (1)

Auto-updated May 12, 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-2026-34344

Vendor Advisories for CVE-2026-34344(1)

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 / 76× 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 192 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-34344?
CVE-2026-34344 is a high vulnerability published on May 12, 2026. Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
When was CVE-2026-34344 disclosed?
CVE-2026-34344 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on June 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34344 actively exploited?
CVE-2026-34344 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 23.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34344?
CVE-2026-34344 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-34344?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34344, 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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