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> >Any chance of some details of just what it is in the internal subset
> >which triggers this behaviour, and how?
> You can easily construct a few entities that expand to a huge result.
> Depending on how your parser returns things, this may use lots of
> memory or merely use up lots of cpu time. There is an example at
> I don't recommend loading this file into a browser.
This is exactly the attack reported to us.
So I don't need to post it anymore.
For Expat and MSXML this is a CPU hog only.
However, you can turn it into a memory hog on these parsers
by using an external subset and PE entities/references instead
of GE references/entities (except for the last one).