CVE-2026-70470

UNKNOWN 0.0

Flowise: Pyodide validator Unicode homoglyph bypass leads to RCE

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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 __cl𝐚ss__, __subcl𝐚sses__, __b𝐚se__, and __b𝐮iltins__ bypass the blacklist and are parsed as their ASCII equivalents. This issue is fixed in version 3.1.3.

CWE	CWE-184
Vendor	flowiseai
Product	flowise
Published	Aug 4, 2026

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Affected Versions

FlowiseAI / Flowise

< 3.1.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-52fh-8v99-63c2 github.com: https://github.com/FlowiseAI/Flowise/pull/6499 github.com: https://github.com/FlowiseAI/Flowise/commit/f4e2794f6a576b94578f2fdafbf49c2fb304626c github.com: https://github.com/FlowiseAI/Flowise/releases/tag/[email protected]