CVE-2026-42048 | THREATINT

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.

PUBLISHED Reserved 2026-04-23 | Published 2026-05-12 | Updated 2026-05-13 | Assigner GitHub_M

CRITICAL: 9.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

Problem types

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

Product status

< 1.9.0

affected

References

github.com/...ngflow/security/advisories/GHSA-9whx-c884-c68q exploit

github.com/...ngflow/security/advisories/GHSA-9whx-c884-c68q

cve.org (CVE-2026-42048)

nvd.nist.gov (CVE-2026-42048)

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