CVE-2026-42867

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.

• CWE-22

• 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

Published

Jun 23, 2026

Last Modified

Jun 26, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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