CVE-2026-42867
Medium
Description
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.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Langflow
PublishedJun 23, 2026
First seenJun 23, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- langflow langflow1.9.0 or later
- langflow1.9.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| langflow langflow | v < 1.9.0 | 1.9.0 |
| langflowPyPI | v < 1.9.0 | 1.9.0 |
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