A critical security vulnerability has been discovered in Langflow, a popular language learning and translation platform, known as CVE-2025-3248. Versions of Langflow prior to 1.3. are susceptible to code injection attacks via the /api/v1/validate/code endpoint. This vulnerability allows remote and unauthenticated attackers to execute arbitrary code on the vulnerable server simply by sending maliciously crafted HTTP requests.

Affected Versions

Langflow versions prior to 1.3..

Vulnerability Details

The /api/v1/validate/code endpoint in Langflow does not securely parse user input, making it vulnerable to code injection attacks. An attacker can craft a malicious HTTP request containing arbitrary code that will be executed on the vulnerable server. Unauthenticated attackers can exploit this vulnerability remotely.

Proof of Concept Code Snippet

The following Python code can be used to craft a malicious HTTP request and exploit the vulnerability in Langflow:

import requests

url = "http://target.com/api/v1/validate/code";
headers = {
    "Content-Type": "application/json"
}

# Replace 'arbitrary_code' with the desired payload
data = {
    "code": "; arbitrary_code"
}

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

Original References

1. CVE-2025-3248 on NVD
2. Langflow GitHub Repository

Impact

An attacker exploiting this vulnerability can execute arbitrary code, potentially leading to complete compromise of the affected system. This may result in unauthorized access to sensitive data or enable attackers to leverage the compromised system as a pivot point for further attacks on the targeted network.

Solution

It is highly recommended to update Langflow to version 1.3. or later, which resolves the vulnerability. Users can access the latest version from the Langflow GitHub Repository. It is also essential to routinely monitor all server logs for any suspicious activity indicative of code injection attempts.

Conclusion

The CVE-2025-3248 vulnerability affects Langflow versions prior to 1.3., exposing systems to code injection attacks. Timely patching and remaining vigilant to potential malicious activity can help prevent exploitation and protect your critical assets from unauthorized access.

Timeline

Published on: 04/07/2025 15:15:44 UTC
Last modified on: 04/09/2025 19:15:50 UTC