CVE-2026-42867

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (38th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, Langflow is vulnerable to Path Traversal in the Knowledge Bases API (POST /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are used directly to create file paths without proper sanitization or containment checks. An authenticated attacker can exploit this flaw to create directories and write files anywhere on the server's filesystem. This vulnerability is fixed in 1.9.0.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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 (value × EchelonGraph’s weight)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation0% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 16, 2026

Last Modified

June 26, 2026

Advisory Details (2)

Auto-updated Jun 23, 2026
Patch available. Sources: github_pr, github.
githubMentions a patch (unverified)

Path Traversal in Knowledge Bases API via Creation Endpoint · Advisory · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxq
github_pr

fix: prevent path traversal in knowledge base create endpoint

Fix merged in langflow-ai/langflow PR #12337 on 2026-03-26 — awaiting tagged release

https://github.com/langflow-ai/langflow/pull/12337

Vendor Advisories for CVE-2026-42867(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
langflow0.0.31 ... 1.8.4 (293 versions)
  • every version up to 1.9.0: fixed in 1.9.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 25× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 129 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 30 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 17:03 UTCEG score recompute
  2. 2026-10-11 14:29 UTCEG score recompute
  3. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  4. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  5. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  6. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  7. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  8. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  9. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  10. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  11. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  12. 2026-10-03 07:09 UTCOSV refresh
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  15. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  16. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  17. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  18. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-09-14 03:31 UTCEG score recompute
  24. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.5% · 39th percentile
Show 74 more
  1. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  2. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  3. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  4. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  5. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  6. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  7. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  8. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  9. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  10. 2026-08-30 22:48 UTCEG score recompute
  11. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  12. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  13. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  14. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  15. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  16. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  17. 2026-08-24 23:24 UTCEG score recompute
  18. 2026-08-23 09:26 UTCEG score recompute
  19. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 28th percentile
  20. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 28th percentile
  21. 2026-08-21 09:46 UTCEG score recompute
  22. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 28th percentile
  23. 2026-08-20 10:58 UTCEG score recompute
  24. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  25. 2026-08-19 13:07 UTCEG score recompute
  26. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  27. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  28. 2026-08-16 22:00 UTCEG score recompute
  29. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  30. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  31. 2026-08-15 22:28 UTCEG score recompute
  32. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  33. 2026-08-14 02:41 UTCEG score recompute
  34. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  35. 2026-08-13 04:50 UTCEG score recompute
  36. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  37. 2026-08-12 06:59 UTCEG score recompute
  38. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  39. 2026-08-11 09:08 UTCEG score recompute
  40. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  41. 2026-08-10 11:18 UTCEG score recompute
  42. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  43. 2026-08-09 13:26 UTCEG score recompute
  44. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  45. 2026-08-07 17:45 UTCEG score recompute
  46. 2026-08-06 19:54 UTCEG score recompute
  47. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  48. 2026-08-05 22:03 UTCEG score recompute
  49. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  50. 2026-08-05 00:12 UTCEG score recompute
  51. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  52. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  53. 2026-08-04 02:16 UTCEG score recompute
  54. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  55. 2026-08-02 06:34 UTCEG score recompute
  56. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  57. 2026-08-01 08:20 UTCEG score recompute
  58. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  59. 2026-07-31 04:24 UTCEG score recompute
  60. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  61. 2026-07-30 04:15 UTCEG score recompute
  62. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  63. 2026-07-29 03:03 UTCEG score recompute
  64. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  65. 2026-07-27 18:16 UTCEG score recompute
  66. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  67. 2026-07-26 19:51 UTCEG score recompute
  68. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  69. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  70. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  71. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  72. 2026-07-23 03:12 UTCEG score recompute
  73. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  74. 2026-07-21 15:24 UTCEPSS rescoreEPSS 0.3% · 23rd percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-42867?
CVE-2026-42867 is a medium-severity vulnerability; its CVE record was published on June 16, 2026. Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, Langflow is vulnerable to Path Traversal in the Knowledge Bases API (POST /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are used directly to create file paths without…
When was the CVE record for CVE-2026-42867 published?
The CVE record for CVE-2026-42867 was published on June 16, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 26, 2026; the record at its source may have been updated since.
Is CVE-2026-42867 actively exploited?
CVE-2026-42867 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-42867?
CVE-2026-42867 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-42867?
A fix for CVE-2026-42867 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-42867 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-42867

Explore →

Is Your Infrastructure Affected by CVE-2026-42867?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs