CVE-2026-34346

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-07-14. the CNA's CVSS baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

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

Cleartext transmission of sensitive information in Windows Ancillary Function Driver for WinSock allows an authorized attacker to disclose information locally.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

July 14, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Jul 15, 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-2026-34346

Vendor Advisories for CVE-2026-34346(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 23× in last 7d / 106× 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 166 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-34346?
CVE-2026-34346 is a medium vulnerability published on July 14, 2026. Cleartext transmission of sensitive information in Windows Ancillary Function Driver for WinSock allows an authorized attacker to disclose information locally.
When was CVE-2026-34346 disclosed?
CVE-2026-34346 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34346 actively exploited?
CVE-2026-34346 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 81.2% of all scored CVEs.
What is the CVSS score of CVE-2026-34346?
CVE-2026-34346 has a CVSS v4.0 base score of 5.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-34346?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34346, 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

Explore the affected products and dependency analysis for CVE-2026-34346

Explore →

Is Your Infrastructure Affected by CVE-2026-34346?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs