Warn about possible risks when extracting untrusted archives.
diff --git a/Doc/library/tarfile.rst b/Doc/library/tarfile.rst
index a0cd673..f7e339f 100644
--- a/Doc/library/tarfile.rst
+++ b/Doc/library/tarfile.rst
@@ -337,6 +337,13 @@
reset each time a file is created in it. And, if a directory's permissions do
not allow writing, extracting files to it will fail.
+ .. 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:: 2.5
@@ -353,6 +360,10 @@
are some issues you must take care of yourself. See the description for
:meth:`extractall` above.
+ .. warning::
+
+ See the warning for :meth:`extractall`.
+
.. method:: TarFile.extractfile(member)