Index: Lib/zipfile.py
===================================================================
--- Lib/zipfile.py	(revision 87413)
+++ Lib/zipfile.py	(working copy)
@@ -256,6 +256,13 @@
             # Try to read the "Zip64 end of central directory" structure
             return _EndRecData64(fpin, maxCommentStart + start - filesize,
                                  endrec)
+        else:
+            # be robust to non-comment extaneous data after endrec
+            # by making it a comment so that nothing is ever lost
+            endrec[_ECD_COMMENT_SIZE] = len(comment)
+            endrec.append(comment)
+            endrec.append(maxCommentStart + start)
+            return endrec
 
     # Unable to find a valid end of central directory structure
     return
Index: Lib/test/test_zipfile.py
===================================================================
--- Lib/test/test_zipfile.py	(revision 87413)
+++ Lib/test/test_zipfile.py	(working copy)
@@ -723,6 +723,10 @@
             b'\x01\x003\x00\x00\x003\x00\x00\x00\x00\x00'),
     }
 
+    def test_ignores_comments(self):
+        with zipfile.ZipFile("README.zip") as zf:
+            self.assertIsInstance(zf, zipfile.ZipFile)
+
     def test_unicode_filenames(self):
         with zipfile.ZipFile(TESTFN, "w") as zf:
             zf.writestr("foo.txt", "Test for unicode filename")