util/emailutils.py in Matrix Sydent before 1.0.2 mishandles registration restrictions that are based on e-mail domain, if the allowed_local_3pids option is enabled. This occurs because of potentially unwanted behavior in Python, in which an email.utils.parseaddr call on user@bad.example.net@good.example.com returns the user@bad.example.net substring.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| matrix-sydent(PyPI) | 0 | 1.0.2 | N/A |
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