CVE-2026-69264

CVE-2026-69264 · Flowise: RCE via CSVAgent csvFile data URI base64 segment is interpolated into Python source without validation

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Prior to 3.1.3, Flowise CSVAgent interpolates an attacker-controlled segment of the csvFile data URI directly into a Python source-code template that is then executed by Pyodide. Because Pyodide is loaded with the default js bridge to globalThis, which on Node.js exposes eval and dynamic import, the attacker can break out of the Python string literal, hand a JavaScript string to js.eval, dynamically import Node built-in modules such as fs and child_process, and execute arbitrary file I/O or OS commands as the Flowise process. The two validator paths around this code, validatePythonCodeForDataFrame and validateCustomReadCSVFunction, are never applied to the bootstrap template. A workspace user with chatflows:create or agentflows/chatflows update permission can plant a CSV Agent node with a crafted csvFile; once the chatflow is exposed via POST /api/v1/prediction/:id, any unauthenticated request triggers host remote code execution. This issue is fixed in version 3.1.3.

CVSS 9.4 · Critical · EPSS 1.1% · Fix available

Published

2026-08-04T17:22:36.676Z

Updated

2026-08-04T17:53:00.329Z

Stack: node

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