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TI-2026-04385 Aliases CVE-2026-5027GHSA-wr3v-m658-mf42

Langflow - Path Traversal Arbitrary File Write via upload_user_file

Priority HIGH 68CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.39973 98th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Langflowlangflowall versions—No fix listedCNA
  • langflow VendorLangflow Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:langflow:langflow:*:-:*:*:*:*:*:*before 1.9.0VulnerableLangflow
  • cpe:2.3:a:langflow:langflow:*:-:*:*:*:*:*:* Versions before 1.9.0 Vulnerable ·Langflow

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-5027
  2. 2026-10-03 Alias added: GHSA-wr3v-m658-mf42
  3. 2026-10-25 EPSS moved to the 95th–99th percentile
  4. 2026-10-25 Priority changed: MEDIUM → HIGH

References

Advisory 1

  • TI-2026-08085 Unauthenticated Remote Code Execution via Auto-Login Bypass and Code Validation KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-00553 Langflow exec_globals Inclusion of Functionality from Untrusted Control Sphere Remote… KEVCVSS 3.0CRITICAL 9.8
  • TI-2025-24427 Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE KEVCVSS 4.0CRITICAL 9.4
  • TI-2025-02845 Langflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/code KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-25463 Langflow has Unauthenticated Remote Code Execution via Public Flow Build Endpoint KEVCVSS 4.0CRITICAL 9.3
  • TI-2026-39928 Authorization bypass in langflow KEVCVSS 3.1HIGH 8.4
See all 216 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences