CVE-2026-42904

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreHIGH confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-09. the CNA's CVSS baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
9.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.6Exploit: NoneExposed: 0

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

Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.

CVSS v3
9.6
EG Score
9.6(high)
EPSS
35.2%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 1, 2026

Advisory Details (1)

Auto-updated Jun 9, 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-2026-42904

Vendor Advisories for CVE-2026-42904(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 0× in last 7d / 0× 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.

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

Frequently asked(5)

What is CVE-2026-42904?
CVE-2026-42904 is a critical vulnerability published on June 9, 2026. Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.
When was CVE-2026-42904 disclosed?
CVE-2026-42904 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-2026-42904 actively exploited?
CVE-2026-42904 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42904?
CVE-2026-42904 has a CVSS v4.0 base score of 9.6 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-42904?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42904, 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-2026-42904

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