CVE-2026-42048

Langflow: Path Traversal in Langflow Knowledge Bases API

State: Published
Severity: 9.6 Critical
Published: May 12, 2026
Updated: May 13, 2026
Reserved: Apr 23, 2026

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 (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.

Scores

CVSS	Score	Vector	Source
3.1	9.6 Critical	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Product	Versions
langflowlangflow-ai	< 1.9.0Affected

References

https://github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68q

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