CVE-2026-34335

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 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-2026-34335

Vendor Advisories for CVE-2026-34335(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 10× in last 7d / 60× 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 356 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-34335?
CVE-2026-34335 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-2026-34335 disclosed?
CVE-2026-34335 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-2026-34335 actively exploited?
CVE-2026-34335 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-2026-34335?
CVE-2026-34335 has a CVSS v4.0 base score of 7.0 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-34335?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34335, 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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