CVE-2026-8859

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-17. a secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.9Exploit: None knownExposed: 0

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

IBM Langflow OSS 1.0.0 through 1.10.0 Langflow could allow an attacker to write arbitrary files to unintended locations due to improper input validation in the APIRequest component. A path traversal vulnerability exists when the "Save to File" feature is enabled, where filenames extracted from HTTP response Content-Disposition headers are not sanitized before being joined to the temporary directory path. An attacker controlling an external HTTP server can supply crafted filename values containing path traversal sequences (e.g., ../), enabling arbitrary file writes to locations accessible by the Langflow process.

CVSS v3
9.9
EG Score
9.9(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity99% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

July 17, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Aug 27, 2026
No patch confirmed yet.
generic

Security Bulletin: Path Traversal in APIRequest Component via Content-Disposition Header

https://www.ibm.com/support/pages/node/7278924

Vendor Advisories for CVE-2026-8859(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 37× in last 7d / 220× 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 280 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-8859?
CVE-2026-8859 is a critical vulnerability published on July 17, 2026. IBM Langflow OSS 1.0.0 through 1.10.0 Langflow could allow an attacker to write arbitrary files to unintended locations due to improper input validation in the APIRequest component. A path traversal vulnerability exists when the "Save to File" feature is enabled, where filenames extracted from HTTP…
When was CVE-2026-8859 disclosed?
CVE-2026-8859 was first published in the National Vulnerability Database on July 17, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8859 actively exploited?
CVE-2026-8859 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 55.9% of all scored CVEs.
What is the CVSS score of CVE-2026-8859?
CVE-2026-8859 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-8859?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8859, 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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