ptarjan/online-yaml-parser — pull request #1 by PiPeep (2012-04-30 23:35:04+00:00)
Title: Using yaml.load is Dangerous for Untrusted Input

Fixed a [server-side injection vulnerability](http://pyyaml.org/wiki/PyYAMLDocumentation#LoadingYAML).

I haven't tested this (I don't have an appspot account to do it with), but as it stands, I can construct Python objects with your webapp.