Manually copy patch for bug 7250 from the release26-maint branch.  I suck
because I did this in the wrong order and couldn't smack svnmerge into
submission.
diff --git a/Misc/NEWS b/Misc/NEWS
index 55700b7..68619ea 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -94,6 +94,9 @@
 Library
 -------
 
+- Issue #7250: Fix info leak of os.environ across multi-run uses of
+  wsgiref.handlers.CGIHandler.
+
 - Issue #1729305: Fix doctest to handle encode error with "backslashreplace".
 
 - Issue #691291: codecs.open() should not convert end of lines on reading and