1. Billion laughs attack. https://en.wikipedia.org/wiki/Billion_laughs_attack
2. Chanzhi eps. https://github.com/goodrain-apps/chanzhieps
3. Drupal. https://www.drupal.org/
4. How we got read access on Google’s production servers. https://blog.detectify.com/2014/04/11/how-we-got-read-access-on-googles-production-servers/
5. Joomla. https://www.joomla.org/