CVE-2026-8666

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 51% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

OS Command Injection vulnerability in the traceroute action of Rapid7 InsightConnect Traceroute Plugin on Linux allows remote attackers to execute arbitrary OS commands via the host, port, max_ttl, count, or time_out request parameters due to insufficient input validation when constructing shell commands.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Jul 25, 2026
No patch confirmed yet.
generic

Rapid7 Extensions

https://extensions.rapid7.com/extension/traceroute

Vendor Advisories for CVE-2026-8666(1)

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 27× in last 7d / 87× 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 104 total refreshes for this CVE.

  1. 2026-07-30 02:06 UTCEG score recompute
  2. 2026-07-30 02:06 UTCGHSA enrichment
  3. 2026-07-30 01:30 UTCEPSS rescore
  4. 2026-07-29 17:49 UTCGHSA enrichment
  5. 2026-07-29 13:30 UTCGHSA enrichment
  6. 2026-07-29 09:10 UTCGHSA enrichment
  7. 2026-07-29 04:49 UTCGHSA enrichment
  8. 2026-07-29 00:29 UTCEG score recompute
  9. 2026-07-29 00:29 UTCGHSA enrichment
  10. 2026-07-28 15:37 UTCEPSS rescore
  11. 2026-07-28 15:15 UTCGHSA enrichment
  12. 2026-07-28 06:39 UTCGHSA enrichment
  13. 2026-07-28 02:18 UTCGHSA enrichment
  14. 2026-07-27 21:58 UTCGHSA enrichment
  15. 2026-07-27 17:30 UTCEG score recompute
  16. 2026-07-27 17:30 UTCGHSA enrichment
  17. 2026-07-27 14:14 UTCEPSS rescore
  18. 2026-07-27 09:30 UTCGHSA enrichment
  19. 2026-07-27 05:11 UTCGHSA enrichment
  20. 2026-07-26 23:59 UTCGHSA enrichment
  21. 2026-07-26 19:38 UTCGHSA enrichment
  22. 2026-07-26 15:17 UTCEG score recompute
  23. 2026-07-26 15:17 UTCGHSA enrichment
  24. 2026-07-26 14:54 UTCEPSS rescore
  25. 2026-07-25 14:18 UTCEPSS rescore
Show 75 more
  1. 2026-07-24 14:18 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:23 UTCEG score recompute▲ 2.10
  4. 2026-07-22 14:08 UTCEPSS rescore
  5. 2026-07-21 15:25 UTCEPSS rescore
  6. 2026-07-21 15:25 UTCEPSS rescore
  7. 2026-07-20 17:08 UTCEPSS rescore
  8. 2026-07-19 14:31 UTCEPSS rescore
  9. 2026-07-19 02:29 UTCEPSS rescore
  10. 2026-07-18 10:04 UTCEPSS rescore
  11. 2026-07-17 05:04 UTCGHSA enrichment
  12. 2026-07-16 17:03 UTCEPSS rescore
  13. 2026-07-16 16:12 UTCGHSA enrichment
  14. 2026-07-16 03:05 UTCGHSA enrichment
  15. 2026-07-15 16:57 UTCEPSS rescore
  16. 2026-07-15 14:13 UTCGHSA enrichment
  17. 2026-07-15 02:00 UTCEPSS rescore
  18. 2026-07-15 01:19 UTCGHSA enrichment
  19. 2026-07-14 12:27 UTCGHSA enrichment
  20. 2026-07-13 23:36 UTCGHSA enrichment
  21. 2026-07-13 22:31 UTCEPSS rescore
  22. 2026-07-13 10:45 UTCGHSA enrichment
  23. 2026-07-13 06:13 UTCEPSS rescore
  24. 2026-07-12 21:54 UTCGHSA enrichment
  25. 2026-07-12 09:02 UTCGHSA enrichment
  26. 2026-07-12 05:46 UTCEPSS rescore
  27. 2026-07-11 20:11 UTCGHSA enrichment
  28. 2026-07-11 08:27 UTCEPSS rescore
  29. 2026-07-11 07:20 UTCGHSA enrichment
  30. 2026-07-10 18:29 UTCGHSA enrichment
  31. 2026-07-10 05:31 UTCGHSA enrichment
  32. 2026-07-09 19:10 UTCEPSS rescore
  33. 2026-07-09 16:40 UTCGHSA enrichment
  34. 2026-07-09 03:35 UTCGHSA enrichment
  35. 2026-07-08 15:16 UTCEPSS rescore
  36. 2026-07-08 14:44 UTCGHSA enrichment
  37. 2026-07-08 01:51 UTCGHSA enrichment
  38. 2026-07-07 13:46 UTCEPSS rescore
  39. 2026-07-07 13:00 UTCGHSA enrichment
  40. 2026-07-07 00:09 UTCGHSA enrichment
  41. 2026-07-06 16:27 UTCEPSS rescore
  42. 2026-07-06 16:27 UTCEPSS rescore
  43. 2026-07-06 11:18 UTCGHSA enrichment
  44. 2026-07-06 02:23 UTCEPSS rescore
  45. 2026-07-06 02:23 UTCEPSS rescore
  46. 2026-07-05 21:43 UTCGHSA enrichment
  47. 2026-07-05 08:51 UTCGHSA enrichment
  48. 2026-07-05 02:31 UTCEPSS rescore
  49. 2026-07-05 02:30 UTCEPSS rescore
  50. 2026-07-04 19:59 UTCGHSA enrichment
  51. 2026-07-04 07:08 UTCGHSA enrichment
  52. 2026-07-04 06:31 UTCEPSS rescore
  53. 2026-07-04 06:31 UTCEPSS rescore
  54. 2026-07-03 17:56 UTCGHSA enrichment
  55. 2026-07-03 05:01 UTCGHSA enrichment
  56. 2026-07-02 16:08 UTCGHSA enrichment
  57. 2026-07-02 03:16 UTCGHSA enrichment
  58. 2026-07-01 15:07 UTCEPSS rescore
  59. 2026-07-01 14:25 UTCGHSA enrichment
  60. 2026-07-01 01:34 UTCGHSA enrichment
  61. 2026-06-30 23:22 UTCEPSS rescore
  62. 2026-06-30 12:43 UTCGHSA enrichment
  63. 2026-06-29 23:51 UTCGHSA enrichment
  64. 2026-06-29 19:26 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  65. 2026-06-29 14:06 UTCEPSS rescore
  66. 2026-06-29 10:59 UTCGHSA enrichment
  67. 2026-06-28 22:08 UTCGHSA enrichment
  68. 2026-06-28 14:07 UTCEPSS rescore
  69. 2026-06-28 09:16 UTCGHSA enrichment
  70. 2026-06-28 04:56 UTCEPSS rescore
  71. 2026-06-27 20:25 UTCGHSA enrichment
  72. 2026-06-27 07:34 UTCGHSA enrichment
  73. 2026-06-27 03:08 UTCEPSS rescore
  74. 2026-06-26 18:43 UTCGHSA enrichment
  75. 2026-06-26 05:44 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8666?
CVE-2026-8666 is a critical vulnerability published on June 25, 2026. OS Command Injection vulnerability in the traceroute action of Rapid7 InsightConnect Traceroute Plugin on Linux allows remote attackers to execute arbitrary OS commands via the host, port, maxttl, count, or timeout request parameters due to insufficient input validation when constructing shell…
When was CVE-2026-8666 disclosed?
CVE-2026-8666 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8666 actively exploited?
CVE-2026-8666 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.5% of all scored CVEs.
What is the CVSS score of CVE-2026-8666?
CVE-2026-8666 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-8666?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8666, 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-2026-8666

Explore →

Is Your Infrastructure Affected by CVE-2026-8666?

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

Start Free Scan →Browse All CVEs