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TI-2026-30427 Aliases CVE-2026-42048GHSA-9whx-c884-c68q

Langflow: Path Traversal in Langflow Knowledge Bases API

Priority HIGH 74CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

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

Summary

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 (DELETE /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are concatenated directly into file paths without proper sanitization or boundary validation. An authenticated attacker can exploit this flaw to delete arbitrary directories anywhere on the server's filesystem, leading to data loss and potential service disruption. This vulnerability is fixed in 1.9.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.04195 91st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed langflow (langflow-ai): 1.9.0langflow (PyPI): 1.9.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
Langflowlangflowbefore 1.9.01.9.0Patch availableCNA
—langflow (PyPI)before 1.9.01.9.0Patch availableGHSA-9whx-c884-c68q
  • langflow VendorLangflow Affected before 1.9.0 Fixed in 1.9.0 Patch available CNA
  • langflow (PyPI) Vendor— Affected before 1.9.0 Fixed in 1.9.0 Patch available GHSA-9whx-c884-c68q

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

  • Fix · CNA langflow (langflow-ai) Fixed in 1.9.0
  • Fix · GHSA-9whx-c884-c68q langflow (PyPI) Fixed in 1.9.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42048
  2. 2026-10-03 Alias added: GHSA-9whx-c884-c68q
  3. 2026-10-25 EPSS moved to the 90th–95th percentile

References

Exploit 1

Advisory 1

Other 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