PraisonAI has an SSRF bypass

Summary

The URL checking logic in PraisonAI has a logical flaw that could be bypassed by attackers, leading to SSRF attacks.

Details

The current PraisonAI project uses _validate_url to validate the input URL. The main logic is to perform security checks on the host portion of the URL extracted by urlparse to prevent SSRF attacks.

<img width="1290" height="1145" alt="QQ20260424-151256-24-1" src="https://github.com/user-attachments/assets/d5f16b74-5ad2-444f-8600-b05f78a4b769" />

However, there are indeed differences in parsing between urlparse and the library that actually sends the request. Currently, almost all application scenarios in this project involve first using _validate_url for URL validation, and then using _get_session().get to send the request.

<img width="1143" height="740" alt="QQ20260424-151437-24-2" src="https://github.com/user-attachments/assets/b1bf6ec2-d32a-4dac-b814-da819e8d3c83" />

In reality, its underlying mechanism is requests.get.

<img width="1042" height="576" alt="QQ20260424-151645-24-3" src="https://github.com/user-attachments/assets/e17352c3-4205-44d6-ab6e-75566480215b" />

The core issue: urlparse() and requests disagree on which host a URL like http://127.0.0.1:6666\@1.1.1.1 points to:

• urlparse() treats \ as a regular character and @ as the userinfo-host delimiter, so it extracts hostname as 1.1.1.1 (public)
• requests treats \ as a path character, connecting to 127.0.0.1 (internal)

Below is a test code I wrote following the code.

import sys
from pathlib import Path
from pprint import pprint

sys.path.insert(0, str(Path(r"D:/BaiduNetdiskDownload/PraisonAI-main/PraisonAI-main/src/praisonai-agents")))

from praisonaiagents.tools import spider_tools

# url = "http://127.0.0.1:6666\@1.1.1.1"
url = "http://127.0.0.1:6666"

result = spider_tools.scrape_page(url)

if isinstance(result, dict) and "error" in result:
    print("scrape failed:", result["error"])
else:
    pprint(result)

When an attacker uses http://127.0.0.1:6666/, the existing detection logic can detect that this is an internal network address and block it.

<img width="1068" height="128" alt="QQ20260424-152007-24-4" src="https://github.com/user-attachments/assets/294bff10-2af6-4960-bf69-dbf3340b1e9b" />

However, when an attacker uses http://127.0.0.1:6666\@1.1.1.1, the detection logic resolves the host to 1.1.1.1, which is a public IP address, thus passing the verification. But in the actual request process, this URL is forwarded by requests.get to http://127.0.0.1:6666, bypassing the detection and achieving an SSRF attack.

<img width="2089" height="324" alt="QQ20260424-152123-24-5" src="https://github.com/user-attachments/assets/4421ce42-e47b-48de-a97a-56ce56a2bbc9" />

PoC

http://127.0.0.1:6666\@1.1.1.1

Impact

SSRF