langflow-ai langflow up to 1.8.x Knowledge Bases API /api/v1/knowledge_bases path traversal

Summaryinfo

A vulnerability was found in langflow-ai langflow up to 1.8.x. It has been rated as critical. The impacted element is an unknown function of the file /api/v1/knowledge_bases of the component Knowledge Bases API. The manipulation leads to path traversal. This vulnerability is listed as CVE-2026-42048. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in langflow-ai langflow up to 1.8.x. It has been rated as critical. This issue affects an unknown function of the file /api/v1/knowledge_bases of the component Knowledge Bases API. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is integrity, and availability. The summary by CVE is:

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 (DELETE /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are concatenated directly into file paths without proper sanitization or boundary validation. An authenticated attacker can exploit this flaw to delete arbitrary directories anywhere on the server's filesystem, leading to data loss and potential service disruption. This vulnerability is fixed in 1.9.0.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-42048 since 04/23/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 1.9.0 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• langflow-ai

Name

• langflow

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8

Website

• Product: https://github.com/langflow-ai/langflow/

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