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psalm/docs/running_psalm/issues/TaintedUnserialize.md

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# TaintedUnserialize
Tainted input detected to an `unserialize` call.
Passing untrusted user input to `unserialize` calls is dangerous from the [PHP documentation on unserialize](https://www.php.net/manual/en/function.unserialize.php):
> Do not pass untrusted user input to unserialize() regardless of the options value of allowed_classes. Unserialization can result in code being loaded and executed due to object instantiation and autoloading, and a malicious user may be able to exploit this. Use a safe, standard data interchange format such as JSON (via json_decode() and json_encode()) if you need to pass serialized data to the user.
```php
<?php
$command = $_GET["data"];
getObject($command);
function getObject(string $data) : object {
return unserialize($data);
}
```