TI-2026-31074 Aliases CVE-2026-42867 GHSA-79ph-745m-6wxq

Langflow: Path Traversal in Knowledge Bases API via Creation Endpoint

HIGH 68CWE-22Published 2026-06-23 · Updated 2026-06-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · Low · Low
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 (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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00466 40th 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: Yes
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Langflow	langflow	before 1.9.0	1.9.0	Patch available	CNA
—	langflow (PyPI)	before 1.9.0	1.9.0	Patch available	GHSA-79ph-745m-6wxq

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-79ph-745m-6wxq

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:langflow:langflow::::::::	before 1.9.0	Vulnerable	Langflow

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-79ph-745m-6wxq langflow (PyPI) Fixed in 1.9.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-42867
2026-10-03 Alias added: GHSA-79ph-745m-6wxq

References

Exploit 1

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

Patch 1

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

Advisory 2

Other 3

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