CVE-2026-47291

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-09. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this weekElevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 22%CVSS: 9.8Exploit: NoneExposed: 0

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

Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
97.3%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 1, 2026

Advisory Details (1)

Auto-updated Jul 4, 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-2026-47291

Vendor Advisories for CVE-2026-47291(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 87× in last 7d / 434× 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 434 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCManagerEmpty/CVE-2026-47291-httpsys
    First seen Jun 10, 2026

    HTTP.sys RCE

    Open source ↗

Frequently asked(5)

What is CVE-2026-47291?
CVE-2026-47291 is a critical vulnerability published on June 9, 2026. Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.
When was CVE-2026-47291 disclosed?
CVE-2026-47291 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-2026-47291 actively exploited?
CVE-2026-47291 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 97.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47291?
CVE-2026-47291 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-47291?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47291, 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-2026-47291

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