Lists are handled just to 3 levels

[hron84]

If i write a big indented lists, it is handled just upto 3 levels, more levels are flatten into the last level of lists.

[vmg]

Hey, this is intended. Redcarpet caps the max nesting of all Markdown elements, because otherwise Markdown syntax can be arbitrarily nested and used to trivially exploit/DDoS the parser with stack overflows.

See the max_nesting argument, I haven't provided any way to change it from Ruby, but feel free to change manually it in your local gem.

Beware, it's risky. Do you really need to nest stuff more than 3 levels deep?

[postmodern]

I recently ran into this, when I noticed that my ChangeLog.md was being rendered incorrectly. I double checked that it wasn't a white-space issue, by testing it with Kramdown. Sure enough RedCarpet cannot handle more than two nested lists by default. While RedCarpet does provide a max_nesting setting, GitHub leaves this at it's default value.

because otherwise Markdown syntax can be arbitrarily nested and used to trivially exploit/DDoS the parser with stack overflows

Also, I am confused when you say allowing arbitrarily nested lists can result in a Distributed Denial of Service (DDoS). Care to explain how this is possible? To my knowledge, no other markdown parser has had this issue.

Do you really need to nest stuff more than 3 levels deep?

Yes I do. My ChangeLog should be rendered correctly. Given that 3 is such a low number, I would assume most people also need this.