Lars Gustäbel added the comment:

After careful consideration and a private discussion with Martin I do no
longer think that we have a security issue here. tarfile.py does nothing
wrong, its behaviour conforms to the pax definition and pathname
resolution guidelines in POSIX. There is no known or possible practical
exploit.

I update the documentation with a warning, that it might be dangerous to
extract archives from untrusted sources. That is the only thing to be
done IMO.

----------
type: security -> behavior

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<http://bugs.python.org/issue1044>
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