FlowiseAI Flowise up to 3.1.2 CSVAgent CSVAgent.ts validatePythonCodeForDataFrame os command injection

Summaryinfo

A vulnerability, which was classified as very critical, was found in FlowiseAI Flowise up to 3.1.2. Affected by this issue is the function validatePythonCodeForDataFrame of the file packages/components/nodes/agents/CSVAgent/CSVAgent.ts of the component CSVAgent. Executing a manipulation can lead to os command injection. This vulnerability is registered as CVE-2026-69255. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in FlowiseAI Flowise up to 3.1.2 and classified as very critical. This vulnerability affects the function validatePythonCodeForDataFrame of the file packages/components/nodes/agents/CSVAgent/CSVAgent.ts of the component CSVAgent. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the CSVAgent in packages/components/nodes/agents/CSVAgent/CSVAgent.ts extracted attacker-controlled CSV data with file.split(',').pop() and interpolated it directly into executable Python as base64_string = "${base64String}" before calling Pyodide. The validatePythonCodeForDataFrame() denylist only checked later LLM-generated code and did not validate this initial code block. An authenticated attacker could inject a closing quote followed by Python code, use Pyodide's js bridge to load Node.js child_process, and execute arbitrary operating system commands as root in the Flowise container. This issue is fixed in version 3.1.3.

The advisory is available at github.com. This vulnerability was named CVE-2026-69255 since 08/03/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/04/2026). This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 3.1.3 eliminates this vulnerability.

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Productinfo

Vendor

• FlowiseAI

Name

• Flowise

Version

• 3.1.0
• 3.1.1
• 3.1.2

Website

• Product: https://github.com/FlowiseAI/Flowise/

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