Is Flask safe?

The code turns strings into live code at runtime (eval / new Function / exec).

eval(compile(f.read(), startup, "exec"), ctx)

exec(compile(config_file.read(), filename, "exec"), d.__dict__)

Why it matters: If those strings aren't fixed and trusted, they become a way to run arbitrary code.

Fix: Avoid evaluating dynamically constructed code; if unavoidable, ensure the input is a trusted constant and never derived from external data.

A server is bound to all network interfaces (0.0.0.0), not just your own machine.

:param host: the hostname to listen on. Set this to ``'0.0.0.0'`` to

Why it matters: Without authentication, other hosts on the network can reach it.

Fix: Bind to 127.0.0.1 for local-only use, or require authentication and restrict access if remote exposure is intended.

The component reads files from disk.

return open(path, mode)  # pyright: ignore

return open(path, mode, encoding=encoding)

return open(path, mode)

return open(path, mode, encoding=encoding)

return open(path, mode)  # pyright: ignore

return open(path, mode, encoding=encoding)

with open(startup) as f:

with open(filename, mode="rb") as config_file:

with open(filename, "r" if text else "rb") as f:

response = super().open(
            request,
            buffered=buffered,
            follow_redirects=follow_redirects,
        )

Why it matters: Usually legitimate, but worth confirming it can't be steered into reading sensitive files.

Fix: Confirm which files are read and that paths cannot be influenced by untrusted input to reach sensitive locations.

The component makes outbound network requests.

from urllib.parse import quote as _url_quote

_anchor = _url_quote(_anchor, safe="%!#$&'()*+,/:;=?@")

from urllib.parse import urlsplit

url = urlsplit(path)

Why it matters: Usually legitimate, but confirm the destinations are expected and no sensitive data leaves.

Fix: Confirm the destination hosts are expected and that no sensitive data is sent off-host.