medium6.5
CVE-2026-42867
Langflow is a tool for building and deploying AI-powered agents and workflows.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | langflow | <= 1.8.4 | 1.9.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Langflow | Langflow | before 1.9.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-79ph-745m-6wxq
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxq
- https://github.com/langflow-ai/langflow/pull/12337
- https://nvd.nist.gov/vuln/detail/CVE-2026-42867
- https://github.com/langflow-ai/langflow
- https://github.com/pypa/advisory-database/tree/main/vulns/langflow/PYSEC-2026-2566.yaml
- https://pypi.org/project/langflow