CVE-2026-27966: Langflow

Critical severity, CVSS 9.8. EPSS: 2.5% chance of exploitation in the next 30 days.

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.8.0, the CSV Agent node in Langflow hardcodes `allow_dangerous_code=True`, which automatically exposes LangChain’s Python REPL tool (`python_repl_ast`). As a result, an attacker can execute arbitrary Python and OS commands on the server via prompt injection, leading to full Remote Code Execution (RCE). Version 1.8.0 fixes the issue.

Affected products

• Langflow Langflow: before 1.8.0 (fixed in 1.8.0)

Published 2026-02-26. Last modified 2026-06-17.