CVE-2026-66730

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-27. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

facil.io 0.6.0 through 0.7.6 contains a denial-of-service vulnerability in the multipart body parser that allows an unauthenticated remote attacker to permanently freeze worker processes at 100% CPU by sending a multipart/form-data request with a partial closing boundary. The missing progress guard in the parser loop causes http_mime_parse to return 0 bytes consumed without setting done or error flags, causing the calling loop to re-invoke the parser on the same buffer indefinitely, exhausting all workers and permanently disabling the server until manually restarted.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

July 27, 2026

Last Modified

July 31, 2026

Advisory Details (2)

Auto-updated Jul 27, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

facil.io 0.6.0 - 0.7.6 Infinite Loop DoS via Multipart MIME Body Parser | Advisories | VulnCheck

https://www.vulncheck.com/advisories/facil-io-infinite-loop-dos-via-multipart-mime-body-parser
generic🟡 PoC Available

GitHub - theopaid/Infinite-Loop-DoS-in-facil.io-MIME-Parser: Security Advisory: Infinite Loop DoS in facil.io MIME Parser (Partial Boundary) · GitHub

https://github.com/theopaid/Infinite-Loop-DoS-in-facil.io-MIME-Parser

Vendor Advisories for CVE-2026-66730(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 19× in last 7d / 90× 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 178 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-66730?
CVE-2026-66730 is a high vulnerability published on July 27, 2026. facil.io 0.6.0 through 0.7.6 contains a denial-of-service vulnerability in the multipart body parser that allows an unauthenticated remote attacker to permanently freeze worker processes at 100% CPU by sending a multipart/form-data request with a partial closing boundary. The missing progress guard…
When was CVE-2026-66730 disclosed?
CVE-2026-66730 was first published in the National Vulnerability Database on July 27, 2026, with the most recent update on July 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66730 actively exploited?
CVE-2026-66730 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 53.4% of all scored CVEs.
What is the CVSS score of CVE-2026-66730?
CVE-2026-66730 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-66730?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66730, 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.

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