API page: https://api.drupal.org/api/drupal/core%21modules%21serialization%21src%2...
Enter a descriptive title (above) relating to NormalizerBase.php, then describe the problem you have found:
Not so much a problem to my uneducated mind. My hosting company sent me a notice "Input Validation vulnerability in Drupal
/.../core/modules/serialization/src/Normalizer/NormalizerBase.php". They patched the file with the attached file (I changed the file extension to txt). I have not noticed any affect, one way or the other.
Would this change be good to add to the current NormalizerBase.php? Will this affect how my Drupal install works? Would this be host specific? Is this a security issue?