Apply the change suggested by PJE for issue 7250. Unfortunately, we couldn't

come up with a unit test. :(

Lib/wsgiref/handlers.py

@@ -468,6 +468,10 @@ class CGIHandler(BaseCGIHandler):
     """
 
     wsgi_run_once = True
+    # Do not allow os.environ to leak between requests in Google App Engine
+    # and other multi-run CGI use cases.  This is not easily testable.
+    # See http://bugs.python.org/issue7250
+    os_environ = {}
 
     def __init__(self):
         BaseCGIHandler.__init__(

Misc/NEWS

@@ -74,6 +74,9 @@ Core and Builtins
 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