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Flowise CVE-2026-70470

| EUVDEUVD-2026-52811 CRITICAL
Incomplete List of Disallowed Inputs (CWE-184)
2026-08-04 GitHub_M GHSA-52fh-8v99-63c2
Python Command Injection Flowise
9.5
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
9.5 CRITICAL
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.0 CRITICAL

Network-reachable but AC:H because a reliable homoglyph payload must be forced through the LLM/config; S:C for Pyodide-to-host escape; full C/I/A on the compromised host.

3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Aug 04, 2026 - 18:02 EUVD
Source Code Evidence Fetched
Aug 04, 2026 - 18:01 vuln.today
Analysis Generated
Aug 04, 2026 - 18:01 vuln.today
CVE Published
Aug 04, 2026 - 17:30 cve.org
CRITICAL 9.5

DescriptionCVE.org

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.

AnalysisAI

Remote code execution in Flowise before 3.1.3 arises because its Pyodide Python-code validator (validatePythonCodeForDataFrame) can be defeated with Unicode homoglyph identifiers, letting an attacker run arbitrary Python that escapes the Pyodide sandbox and executes OS commands on the Flowise host with the process's privileges. The affected CSV Agent and Airtable Agent nodes gate LLM-generated (and config-supplied) Python through an ASCII word-boundary regex blacklist, which Python's NFKC identifier normalization silently rewrites back into the forbidden dunders. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach exposed CSV/Airtable Agent chatflow
Delivery
Inject homoglyph Python via prompt/config
Exploit
Bypass ASCII regex validator
Execution
Python NFKC-normalizes dunders
Persist
Escape Pyodide via js __import__ bridge
Impact
execSync arbitrary OS commands on host
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Vulnerability AssessmentAI

Exploitation Exploitation requires a Flowise deployment (<= 3.1.2) that has a CSV Agent or Airtable Agent node configured and reachable, and the attacker must be able to get crafted Python into that node - either by controlling the CSV Agent's customReadCSV node configuration or by manipulating the LLM (prompt injection through the flow's input) so it emits Python containing NFKC-normalizable homoglyph identifiers (e.g. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This regression reopens the RCE paths previously patched as GHSA-3hjv-c53m-58jj (CSV Agent) and GHSA-v38x-c887-992f (Airtable Agent), and the impact is maximal: full host command execution with sandbox escape (CVSS 4.0 9.5, VC/VI/VA:H and subsequent-system SC/SI/SA:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a query to a network-exposed Flowise chatflow that uses the CSV or Airtable Agent, using prompt injection (or a poisoned customReadCSV config) to make the generated Python contain homoglyph dunders like __cl𝐚ss__ and __b𝐮iltins__. The validator's ASCII \b regex fails to match, Python NFKC-normalizes the identifiers, and __builtins__['__import__']('js') reaches the Node host bridge, invoking child_process.execSync to run commands as the Flowise process. …
Remediation Vendor-released patch: 3.1.3 - upgrade both flowise and flowise-components to 3.1.3 or later (release: https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3; fix PR https://github.com/FlowiseAI/Flowise/pull/6499 and commit f4e2794f6a576b94578f2fdafbf49c2fb304626c). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all Flowise deployments and determine whether CSV Agent or Airtable Agent nodes are actively used; disable these agent types if non-critical or restrict network access to the Flowise instance to authorized users only via firewall or identity-based controls, and audit recent logs for exploitation evidence. …

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CVE-2026-70470 vulnerability details – vuln.today
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