CVE-2026-42048: Langflow Knowledge Bases API is Vulnerable to Path Traversal

May 5, 2026

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.

References

github.com/advisories/GHSA-9whx-c884-c68q
github.com/langflow-ai/langflow
github.com/langflow-ai/langflow/security/advisories/GHSA-9whx-c884-c68q
nvd.nist.gov/vuln/detail/CVE-2026-42048

Code Behaviors & Features

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