Issue python#19883: Fixed possible integer overflows in zipimport.

Author: serhiy-storchaka

Misc/NEWS

@@ -66,6 +66,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #19883: Fixed possible integer overflows in zipimport.
+
 - Issue #26227: On Windows, getnameinfo(), gethostbyaddr() and
   gethostbyname_ex() functions of the socket module now decode the hostname
   from the ANSI code page rather than UTF-8.