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.
| Vendor | Product | Versions |
|---|---|---|
| langflow | langflow | < 1.9.0 |
Updated severity to CRITICAL, marked as actively exploited, and added CVE-2026-42867 as a new tag.
Initial creation
