>> I believe we've found an edge case which isn't correctly caught by the
>> *match_request() *method in attachment.py:462
>> <http://trac.edgewall.org/browser/trunk/trac/attachment.py#L462>.
>>
>> If a filename contains a new line character (e.g. in our case a line
>> feed), then it will never be picked up by the match_request method as
>> the final match group (.*) doesn't account for new lines.
>>
>> One suggested patch would be to add the *re.S* flag to the match, but I
>> wanted to check if anyone knew of any issues (e.g. security) which might
>> arise from this, particularly if any other places in Trac Core assume
>> that a filename doesn't contain a new line character.
>
> My personal feeling is to discourage such an insane filename (report it
> in a warning?) in the first place. Neither have I encountered such a
> wired filename before nor can I see a valid use case and consequently
> the need to support it. Is this unrealistic thinking?

I agree.  Spaces in file names is one thing but vertical white space?
That's insane.

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