CVE-2026-69255 FlowiseAI CVE debrief

Who should care

Flowise users and administrators should assess exposure and prioritize upgrading to version 3.1.3. System administrators and security teams responsible for deploying and managing Flowise instances should verify system integrity and monitor for suspicious activity.

Why it matters

CVE-2026-69255 is a critical vulnerability in Flowise that allows authenticated attackers to execute arbitrary operating system commands as root. Flowise users and administrators should assess exposure and prioritize upgrading to version 3.1.3. The vulnerability can lead to complete system compromise, and verification of system integrity and monitoring for suspicious activity are crucial.

• Authenticated attackers can execute arbitrary operating system commands as root in the Flowise container.
• Successful exploitation can lead to complete system compromise.
• Verification of system integrity and monitoring for suspicious activity are crucial.
• Upgrade to version 3.1.3 is required to fix the vulnerability.

Technical summary

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. This allows an attacker to inject malicious Python code, which can lead to arbitrary operating system command execution as root in the Flowise container. The issue is fixed in version 3.1.3.

Defensive priority

High priority for Flowise users to upgrade to version 3.1.3 and verify system integrity.

Recommended defensive actions

• Upgrade Flowise to version 3.1.3
• Verify system integrity and monitor for suspicious activity
• Restrict access to the Flowise interface to trusted users
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability allows an authenticated attacker to inject malicious Python code, which can lead to arbitrary operating system command execution as root in the Flowise container. The issue is caused by the CSVAgent in packages/components/nodes/agents/CSVAgent/CSVAgent.ts extracting attacker-controlled CSV data and interpolating it directly into executable Python.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.