CVE-2021-21707

In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below
8.0.13, certain XML parsing functions, like simplexml_load_file(),
URL-decode the filename passed to them. If that filename contains
URL-encoded NUL character, this may cause the function to interpret this as
the end of the filename, thus interpreting the filename differently from
what the user intended, which may lead it to reading a different file than
intended.

Bugs

• <https://bugs.php.net/79971&gt;

Notes