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Thu Feb 21 00:21:22 CET 2013 · https://mail.python.org/pipermail/python-dev/2013-February/124200.html

On Wednesday, February 20, 2013 at 6:08 PM, Antoine Pitrou wrote:
> > It's not a distributed DoS issue, it's a severe DoS vulnerabilities. A
> > single 1 kB XML document can kill virtually any machine, even servers
> > with more than hundred GB RAM.
> > 
> 
> 
> Assuming an attacker can inject arbitrary XML. Not every XML document
> is loaded from the Internet.
> 
> 

Even documents not loaded from the internet can be at risk. Often times
security breaches are the result of a chain of actions. You can say "I'm
not loading this XML from the internet, so therefore I am safe" but then
you have another flaw (for example) where you unpack a zip file
without verifying there are not absolute paths and suddenly your xml file has
been replaces with a malicious one.
> Not everyone is a security nuts.
> 
> 

This is precisely why things should be safe by default and allow unsafe
actions to be turned on optionally. 

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[Python-Dev] XML DoS vulnerabilities and exploits in Python