CVE-2026-6599

MEDIUMNVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

Score 6.3 from GitHub Security Advisory (severity: LOW) published 2026-04-20. NVD baseline CVSS 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
6.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.3Exploit: NoneExposed: 0

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

A vulnerability was detected in langflow-ai langflow up to 1.8.3. The impacted element is the function get_client_ip/install_mcp_config of the file src/backend/base/langflow/api/v1/mcp_projects.py of the component Model Context Protocol Configuration API. Performing a manipulation of the argument X-Forwarded-For results in injection. The attack may be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
6.3
EG Score
6.3(medium)
EPSS
14.1%
KEV
Not listed

Published

April 20, 2026

Last Modified

April 29, 2026

References (4)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
piplangflow—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
langflow0.0.31 ... 1.8.3rc0 (292 versions)——

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 42× 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.

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

Frequently asked(5)

What is CVE-2026-6599?
CVE-2026-6599 is a medium vulnerability published on April 20, 2026. A vulnerability was detected in langflow-ai langflow up to 1.8.3. The impacted element is the function getclientip/installmcpconfig of the file src/backend/base/langflow/api/v1/mcp_projects.py of the component Model Context Protocol Configuration API. Performing a manipulation of the argument…
When was CVE-2026-6599 disclosed?
CVE-2026-6599 was first published in the National Vulnerability Database on April 20, 2026, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6599 actively exploited?
CVE-2026-6599 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 14.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-6599?
CVE-2026-6599 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-6599?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6599, 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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