CVE-2025-3248: Langflow Code Injection RCE Vulnerability

CVE-2025-3248 Overview

Langflow versions prior to 1.3.0 are susceptible to code injection in the /api/v1/validate/code endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code.

Critical Impact
Remote Code Execution due to improper input validation in API endpoints.

Affected Products

langflow:langflow

Discovery Timeline

2025-04-07 - CVE-2025-3248 published to NVD
2025-11-06 - Last updated in NVD database

Technical Details for CVE-2025-3248

Vulnerability Analysis

This critical vulnerability arises from a lack of proper input validation in the /api/v1/validate/code endpoint of Langflow. Malicious actors can exploit this flaw by injecting arbitrary code via crafted HTTP requests, leading to potential unauthorized code execution on the server.

Root Cause

The root cause of CVE-2025-3248 is improper input validation in the code validation API, which fails to sanitize input effectively before processing.

Attack Vector

The attack vector for this vulnerability is Network, allowing remote attackers to exploit the system without authentication.

python

# Example exploitation code (sanitized)
import requests

url = "http://victim-host/api/v1/validate/code"

payload = {
    "code": "import os; os.system('malicious command')"
}

response = requests.post(url, json=payload)
print(response.text)

Detection Methods for CVE-2025-3248

Indicators of Compromise

Unusual processes spawned from the validate service
Unexpected outgoing network connections
Suspicious entries in server logs related to /api/v1/validate/code

Detection Strategies

Deploy network monitoring tools to watch for unusual patterns and requests directed at /api/v1/validate/code. Utilize file integrity monitoring to detect unauthorized changes to critical files caused by malicious injections.

Monitoring Recommendations

Implement continuous monitoring of application logs for any anomalies in code execution requests that seem crafted or unexpected.

How to Mitigate CVE-2025-3248

Immediate Actions Required

Apply the security patch from Langflow immediately
Monitor network traffic for signs of exploitation
Disable affected API endpoints if patching is not possible

Patch Information

A patch is available at: Langflow Patch

Workarounds

For systems unable to apply the patch promptly, limit access to the vulnerable endpoint using firewall rules or API gateway restrictions.

bash

# Configuration example to restrict access to vulnerable endpoint
echo "Deny from all" >> /etc/httpd/conf.d/langflow.conf