CVE-2026-51785

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-31. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
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: Elevated riskExposed: 0

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

An issue in Hugo Leisink Hiawatha v.12.1 and before allows a remote attacker to execute arbitrary code via a crafted request

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
75(Attend)
EG Risk 75/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
64%
KEV
Not listed

Published

July 31, 2026

Last Modified

August 3, 2026

Advisory Details (4)

Auto-updated Aug 17, 2026
🔬 Proof of concept available. Patch available.
generic Patch Available🟡 PoC Available

HTTP Request Smuggling in Hiawatha - CVE-2026-51785

https://fenrisk.com/hiawatha-http-smuggling
generic

RFC 9112: HTTP/1.1

https://www.rfc-editor.org/rfc/rfc9112.html#section-6.3
generic
https://www.rfc-editor.org/rfc/rfc2616.html#section-4.4
generic

RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1 | RFC Editor

https://www.rfc-editor.org/rfc/rfc2616

Vendor Advisories for CVE-2026-51785(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 56× in last 7d / 150× 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 150 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51785?
CVE-2026-51785 is a critical vulnerability published on July 31, 2026. An issue in Hugo Leisink Hiawatha v.12.1 and before allows a remote attacker to execute arbitrary code via a crafted request
When was CVE-2026-51785 disclosed?
CVE-2026-51785 was first published in the National Vulnerability Database on July 31, 2026, with the most recent update on August 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51785 actively exploited?
CVE-2026-51785 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 35.6% of all scored CVEs.
What is the CVSS score of CVE-2026-51785?
CVE-2026-51785 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51785?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51785, 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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