CVE-2026-70470: Flowise Pyodide Validator Unicode Homoglyph Bypass Leads to RCE

# CVE-2026-70470: Flowise Pyodide Validator Unicode Homoglyph Bypass Leads to RCE

https://gcdradar.vercel.app/incidents/cve-2026-70470-flowise-pyodide-validator-unicode-homoglyph-b · AIR-2026-0891 · closed 2026-08-04

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-08-04
- AI role: Attack on AI
- Products: Flowise, Pyodide
- CVE ids: CVE-2026-70470
- CVSS: 9.5

## Summary

Unicode homoglyphs can bypass the Python code validator in Flowise, enabling arbitrary code execution inside Pyodide and host OS command execution. Vendor advisories provide mitigation steps.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-08-04: CVE-2026-70470: Flowise is a drag & drop user interface to build a customized large language model flow. (https://nvd.nist.gov/vuln/detail/CVE-2026-70470)
- 2026-08-04: CVE-2026-70470: Flowise: Pyodide validator Unicode homoglyph bypass leads to RCE (https://github.com/advisories/GHSA-52fh-8v99-63c2)

## Sources

- 2026-08-04 GitHub Advisory Database: CVE-2026-70470: Flowise: Pyodide validator Unicode homoglyph bypass leads to RCE https://github.com/advisories/GHSA-52fh-8v99-63c2
- 2026-08-04 NVD: CVE-2026-70470: Flowise is a drag & drop user interface to build a customized large language model flow. https://nvd.nist.gov/vuln/detail/CVE-2026-70470

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.