CVE-2026-27966
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Langflow
PublishedFeb 26, 2026
First seenFeb 26, 2026
Weakness typeCWE-94Code injection
How to fix
Update
- langflow langflow1.8.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| langflow langflow | v < 1.8.0 | 1.8.0 |
| langflowPyPI | v ≤ 1.8.0rc2 | — |
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