[2012-02-03 10:48 UTC] khalid at istartus dot com

Description:
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Long entities can cause a buffer overflow because the loop only guarantees 40 bytes available in beginning.

Test script:
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<?php
echo htmlspecialchars('"""""""""""""""""""""""""""""""""""""""""""""&#x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005;',
ENT_QUOTES, 'UTF-8', false), "\n";