# Security Considerations

The following modules have specific security considerations:

- `base64`: base64 security considerations in RFC 4648

- `hashlib`: all constructors take a «usedforsecurity» keyword-only argument disabling known insecure and blocked algorithms

- `http.server` is not suitable for production use, only implementing basic security checks. See the security considerations.

- `logging`: Logging configuration uses eval()

- `multiprocessing`: Connection.recv() uses pickle

- `pickle`: Restricting globals in pickle

- `random` shouldn’t be used for security purposes, use `secrets` instead

- `shelve`: shelve is based on pickle and thus unsuitable for dealing with untrusted sources

- `ssl`: SSL/TLS security considerations

- `subprocess`: Subprocess security considerations

- `tempfile`: mktemp is deprecated due to vulnerability to race conditions

- `xml`: XML security

- `zipfile`: maliciously prepared .zip files can cause disk volume exhaustion

The `-I` command line option can be used to run Python in isolated mode. When it cannot be used, the `-P` option or the `PYTHONSAFEPATH` environment variable can be used to not prepend a potentially unsafe path to `sys.path` such as the current directory, the script’s directory or an empty string.