CVE-2026-42867

Langflow: Path Traversal in Knowledge Bases API via Creation Endpoint

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 (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.

Scores

Faiblesses (CWE)

• CWE-22

Avis

• GHSA-79ph-745m-6wxq — Langflow: Path Traversal in Knowledge Bases API via Creation Endpoint
• PYSEC-2026-2566 — Langflow: Path Traversal in Knowledge Bases API via Creation Endpoint

Références européennes

• ENISA EUVD · EUVD-2026-38518
• GCVE · GCVE-0-2026-42867

Configurations affectées (CPE NVD)

• cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:* < 1.9.0

Produits affectés

Références

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

Sources