CVE-2026-70470
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
flowisenpm | < 3.1.3 | 3.1.3 |
flowise-componentsnpm | < 3.1.3 | 3.1.3 |
Affected products
1Patches
Vulnerability mechanics
References
5- github.com/FlowiseAI/Flowise/commit/f4e2794f6a576b94578f2fdafbf49c2fb304626cnvdPatchWEB
- github.com/FlowiseAI/Flowise/pull/6499nvdIssue TrackingPatchWEB
- github.com/FlowiseAI/Flowise/releases/tag/[email protected]nvdPatchRelease NotesWEB
- github.com/FlowiseAI/Flowise/security/advisories/GHSA-52fh-8v99-63c2nvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-52fh-8v99-63c2ghsaADVISORY
News mentions
1- ⚡ Weekly Recap: Chinese Spy Proxy, AI Agents Go Off-Task, Router Backdoors and MoreThe Hacker News · Aug 31, 2026