CVE-2026-58057

MEDIUMPre-NVD 5.05.0—
EchelonGraph scoreMEDIUM confidence

Score 5.0 from GitHub Security Advisory (severity: LOW) published 2026-06-28. a secondary CVSS source baseline 5.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 5.0Exploit: Elevated riskExposed: 0

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

Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a case-sensitive comparison, so on Windows, where environment names are case-insensitive, supplying 'node_options' bypasses the NODE_OPTIONS denylist entry. An authenticated user who can configure a Custom MCP node can thereby inject NODE_OPTIONS --require and execute arbitrary code in the Flowise server context.

CVSS v3
5.0
EG Score
5.0(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity50% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
73%
KEV
Not listed

Published

June 28, 2026

Last Modified

July 6, 2026

Advisory Details (3)

Auto-updated Jun 28, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr.
generic🟡 PoC Available

Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity | Advisories | VulnCheck

https://www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivity
generic

exploitarium/flowise-mcp-env-case-bypass-poc at main · bikini/exploitarium · GitHub

https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-poc
github_pr Patch Available

Fix Flowise 552

Patch available: FlowiseAI/Flowise [email protected] (PR #6471 merged 2026-06-03)

https://github.com/FlowiseAI/Flowise/pull/6471

Vendor Advisories for CVE-2026-58057(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 15× in last 7d / 79× 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 145 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

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

  • Exploit-DBEDB-52623
    First seen Jul 7, 2026

    Flowise 3.1.3 - arbitrary code execution

    Open source ↗

Frequently asked(5)

What is CVE-2026-58057?
CVE-2026-58057 is a medium vulnerability published on June 28, 2026. Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a case-sensitive comparison, so on Windows, where environment names are case-insensitive, supplying 'nodeoptions' bypasses the NODEOPTIONS denylist entry. An authenticated user who can configure a Custom…
When was CVE-2026-58057 disclosed?
CVE-2026-58057 was first published in the National Vulnerability Database on June 28, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58057 actively exploited?
CVE-2026-58057 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 26.7% of all scored CVEs.
What is the CVSS score of CVE-2026-58057?
CVE-2026-58057 has a CVSS v3 base score of 5.0 (NVD).
How do I remediate CVE-2026-58057?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58057, 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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