Merged revisions 75149 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r75149 | gregory.p.smith | 2009-09-29 14:56:31 -0700 (Tue, 29 Sep 2009) | 3 lines

  Mention issue6972 in extractall docs about overwriting things outside of
  the supplied path.
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Doc/library/zipfile.rst

@@ -205,6 +205,13 @@ ZipFile Objects
    be a subset of the list returned by :meth:`namelist`.  *pwd* is the password
    used for encrypted files.
 
+   .. warning::
+
+      Never extract archives from untrusted sources without prior inspection.
+      It is possible that files are created outside of *path*, e.g. members
+      that have absolute filenames starting with ``"/"`` or filenames with two
+      dots ``".."``.
+
    .. versionadded:: 2.6