CVE-2026-45599

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. the CNA's CVSS baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.1Exploit: NoneExposed: 0

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

Use after free in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code over a network.

CVSS v3
8.1
EG Score
8.1(high)
EPSS
40.4%
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-2026-45599

Vendor Advisories for CVE-2026-45599(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 36× in last 7d / 167× 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 167 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-45599?
CVE-2026-45599 is a high vulnerability published on June 9, 2026. Use after free in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code over a network.
When was CVE-2026-45599 disclosed?
CVE-2026-45599 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-2026-45599 actively exploited?
CVE-2026-45599 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45599?
CVE-2026-45599 has a CVSS v4.0 base score of 8.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-45599?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45599, 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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