Symfony version(s) affected

7.1.*

Description

When attempting to validate a file using the #[Assert\File] constraint, the filenameMaxLength of the filename is incorrectly calculated if the name contains non-Latin characters.

#[Assert\File(
    maxSize: '10M',
    mimeTypes: ['application/pdf'],
    filenameMaxLength: 250,
)]

How to reproduce

1. Create a file with a name containing more then 20 non-Latin characters.
2. Validate the file using #[Assert\File] with the filenameMaxLength: 20 constraint.
3. Observe the validation result.

Possible Solution

On line 143, the function strlen needs to be replaced with mb_strlen.

File: FileValidator

This will ensure proper handling of filenames containing multibyte characters, such as non-Latin characters, when calculating the string length.

Additional Context

No response