Fixes the following security issues:
- bpo-42278: Replaced usage of tempfile.mktemp() with TemporaryDirectory to
avoid a potential race condition.
- bpo-41180: Add auditing events to the marshal module, and stop raising
code.__init__ events for every unmarshalled code object. Directly
instantiated code objects will continue to raise an event, and audit event
handlers should inspect or collect the raw marshal data. This reduces a
significant performance overhead when loading from .pyc files.
- bpo-44394: Update the vendored copy of libexpat to 2.4.1 (from 2.2.8) to
get the fix for the CVE-2013-0340 “Billion Laughs” vulnerability. This
copy is most used on Windows and macOS.
- bpo-43124: Made the internal putcmd function in smtplib sanitize input for
presence of \r and \n characters to avoid (unlikely) command injection.
https://www.python.org/downloads/release/python-397/
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
