CVE-2026-42867
Last modified
CVE-2026-42867 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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). EPSS estimates a 0.28% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Langflow | Langflow | < 1.9.0 |
References
- https://github.com/langflow-ai/langflow/pull/12337Patch, Issue Tracking
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxqExploit, Vendor Advisory
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxqExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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