github / github/codeql

Flask ImmutableMultiDict type cannot be accurately determined when calling to_dict

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Description

In Flask, the ImmutableMultiDict type cannot be accurately determined when calling to_dict()

```
from flask import Flask, render_template, request, redirect, url_for

def post(self):
f = request.form
param = f.to_dict()
vv = param["vv"]
pp = "/test/%s" % (vv)
os.system(pp)
```

![Image](https://github.com/user-attachments/assets/2fb58e31-495b-4512-a9f8-9df2e600d595)

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