CVE-2026-33309 Langflow has an Arbitrary File Write (RCE) via v2 API

Langflow is a tool for building and deploying AI-powered agents and workflows. Versions 1.2.0 through 1.8.1 have a bypass of the patch for CVE-2025-68478 External Control of File Name, leading to the root architectural issue within LocalStorageService remaining unresolved. Because the underlying...

CVE-2026-33309

Summary (concrete details): CVE-2026-33309 affects Langflow 1.2.0–1.8.1 where a bypass of the CVE-2025-68478 patch enables an Arbitrary File Write via the v2 API endpoint /api/v2/files/. The root issue lies in the storage layer’s LocalStorageService, which lacks proper boundary containment checks...

PT-2026-26336

Name of the Vulnerable Software and Affected Versions Langflow versions prior to 1.7.1 Description Langflow is susceptible to an arbitrary file write issue through the POST /api/v2/files API endpoint. The vulnerability stems from a lack of boundary containment checks in the storage layer, which...