CVE-2026-70470 Details
Description
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.
A vulnerability in Flowise versions prior to 3.1.3 allows for arbitrary Python execution within Pyodide, and full operating system command execution on the Flowise host, via a bypass of the 'validatePythonCodeForDataFrame' function. This bypass is achieved using Unicode homoglyph identifiers, which exploit the validator's ASCII word-boundary blacklist. The issue arises because JavaScript regex word boundaries do not recognize Unicode letters as word characters, allowing homoglyph forms to evade detection and be executed as normal identifiers. The vulnerability is present in the 'CSVAgent' and 'AirtableAgent' components.
Users can update to Flowise version 3.1.3 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Aug 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-52fh-8v99-63c2 | CISA-ADP | ExploitVendor Advisory |
| https://github.com/FlowiseAI/Flowise/commit/f4e2794f6a576b94578f2fdafbf49c2fb304626c | [email protected] | Patch |
| https://github.com/FlowiseAI/Flowise/pull/6499 | [email protected] | Issue TrackingPatch |
| https://github.com/FlowiseAI/Flowise/releases/tag/[email protected] | [email protected] | PatchRelease Notes |
| https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-52fh-8v99-63c2 | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-184 | Incomplete List of Disallowed Inputs | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| flowiseai flowise | < 3.1.3 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 14, 2026 | Initial Analysis | [email protected] |
| Aug 4, 2026 | CVE Modified | CISA-ADP |
| Aug 4, 2026 | New CVE Received | [email protected] |