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

What is CVE-2026-27966?

CVE-2026-27966 is a critical code injection vulnerability in Langflow Langflow, published on 26 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-94

Which versions are affected by CVE-2026-27966?

3 open source packages ship an affected version, including langflow. It affects 1 product.

Products include Langflow Langflow.

How do I fix CVE-2026-27966?

No fix has been published for CVE-2026-27966 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-27966 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27966 exists.

Public exploit code: 1 Metasploit module and 2 proofs of concept on GitHub.

Other vulnerabilities in Langflow Langflow

• CVE-2026-9198 IBM Langflow Code Injection Exploited Critical 9.8
• CVE-2026-0770 Langflow Inclusion of Functionality from Untrusted Control Sphere Exploited Critical 9.8
• CVE-2025-3248 Langflow Missing Authentication Exploited Critical 9.8
• CVE-2025-34291 Langflow Origin Validation Error Exploited Critical 9.4
• CVE-2026-33017 Langflow Code Injection Exploited Critical 9.3

All Langflow Langflow vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-3645-fxcv-hqr4, PYSEC-2026-376.