Active Exploits Target Critical Vulnerability in Langflow AI Development Tool
A severe flaw in Langflow enables unauthenticated attackers to run arbitrary Python code via an exposed API endpoint, prompting urgent patching.
The US Cybersecurity and Infrastructure Security Agency (CISA) has confirmed active exploitation of a critical vulnerability (CVE-2025-3248) in Langflow, an open-source platform for building AI agents. The flaw allows unauthenticated remote code execution (RCE) via an unprotected API endpoint (/api/v1/validate/code), prompting its addition to CISA’s Known Exploited Vulnerabilities (KEV) catalog.
Key Details:
- Impact: Attackers can execute arbitrary Python code on servers running Langflow, which is widely used to automate workflows with large language models (LLMs).
- Exposure: Over 500 internet-facing Langflow instances identified, with many more in internal networks.
- Exploitation: Researchers from Horizon3.ai demonstrated RCE by abusing Python decorators and default arguments. A Metasploit module has since been released.
Mitigation:
- Patch: Upgrade to Langflow v1.3.0 (released April 1) or later.
- Recommendations:
- Isolate Langflow deployments in a VPC or behind SSO.
- Monitor for unauthorized access, as even authenticated users can escalate to superuser privileges.
"Caution is advised when exposing AI tools to the internet. One errant deployment can lead to a breach." — Horizon3.ai
Tags: #Cybersecurity #AI #Vulnerability
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About the Author
Dr. Emily Wang
AI Product Strategy Expert
Former Google AI Product Manager with 10 years of experience in AI product development and strategy formulation. Led multiple successful AI products from 0 to 1 development process, now provides product strategy consulting for AI startups while writing AI product analysis articles for various tech media outlets.