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.

CVSS 3.1

6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

EPSS

0.5% chance of exploitation in the next 30 days; higher than 40% of CVEs (scores of 2026-10-25)

CWE

CWE-22

Published

2026-06-23

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• langflow:langflow

Packages (OSV)

References

• https://github.com/langflow-ai/langflow/pull/12337
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxq
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxq

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