Fatal error in CsvEncoder

[Rudloff]

Symfony version(s) affected

7.0.6

Description

Fuzzing reveals that CsvEncoder throws a fatal error with some values:

PHP Fatal error:  Uncaught TypeError: Cannot access offset of type string on string in /home/pierre/www/fuzzer/vendor/symfony/serializer/Encoder/CsvEncoder.php:179

How to reproduce

Here is the smallest value I was able to reproduce with:

<?php

require __DIR__.'/vendor/autoload.php';

$encoder = new \Symfony\Component\Serializer\Encoder\CsvEncoder();
var_dump($encoder->decode(',.
,', 'csv'));

Possible Solution

No response

Additional Context

I am using php-fuzzer to test various input.