CVE-2026-70470 CRITICAL

CVE-2026-70470: Flowise: Pyodide validator Unicode homoglyph bypass leads to RCE

Vendor Flowiseai
Product Flowise
Weakness CWE-184
Published August 4, 2026
Last update August 4, 2026
View on NVD All CVEs

CVSS base score

9.5/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality โ€”
Integrity โ€”

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

What the vulnerability does

01Description

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, Flowise validatePythonCodeForDataFrame in packages/components/src/pythonCodeValidator.ts can be bypassed with Unicode homoglyph identifiers, allowing arbitrary Python execution inside Pyodide and full OS command execution on the Flowise host via Pyodide js module interop. The validator gates pyodide.runPythonAsync in packages/components/nodes/agents/CSVAgent/CSVAgent.ts and packages/components/nodes/agents/AirtableAgent/AirtableAgent.ts with an ASCII word-boundary blacklist. JavaScript regex word boundaries are ASCII-only, while Python 3 NFKC-normalizes identifiers at parse time, so homoglyph forms such as __cl๐šss__, __subcl๐šsses__, __b๐šse__, and __b๐ฎiltins__ bypass the blacklist and are parsed as their ASCII equivalents. This issue is fixed in version 3.1.3.

Key dates

02Disclosure timeline

August 4, 2026 CVE published