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Tool Directory

CVE-2026-27966

CriticalPublished

Langflow has Remote Code Execution in CSV Agent

Published: Feb 26, 2026
Updated: Feb 28, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 25, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

33.7%

Moderate · next 30 days

Percentile: 98.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-27966Exploit
Pre-auth RCE scanner for Langflow < 1.8.0 — Route Injection + Vertex Injection → Code Execution (CVSS 9.8)
CVE-2026-27966--RCE-in-LangflowExploit
All-in-one exploit tool for CVE-2026-27966, a critical RCE in Langflow. Features mass scanning, auto-detection, payload execution, interactive shell, proxy support, and user-agent rotation for penetration testing.

Responsible use

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