Summary:
It have been identified that `urlparse` under `urllib.parse` module is detecting wrong hostname which could leads to a security issue known as Open redirect vulnerability.

Steps to reproduce the issue:

Following code will help you in reproducing the issue:

```
from urllib.parse import urlparse
x= 'http://www.google.com\@xxx.com'
y = urlparse(x)
print(y.hostname)
```

Output:
xxx.com

The hostname from above URL which is actually rendered by browser is : 'https://www.google.com'.

In following browsers tested: (hostname detected as: https://www.google.com)

```
1. Chromium - Version 72.0.3626.7  - Developer Build
2. Firefox - 60.4.0esr (64-bit)
3. Internet Explorer - 11.0.9600.17843
4. Safari - Version 12.0.2 (14606.3.4)
```