Release Date: Dec. 6, 2022

This is a security release of Python 3.7

Note: The release you are looking at is a security bugfix release for the legacy 3.7 series which has now reached end-of-life and is no longer supported. See the downloads page for currently supported versions of Python. The final security bugfix release for 3.7 was 3.7.17.

Security content in this release

• gh-98739: Updated bundled libexpat to 2.5.0 to fix CVE-2022-43680 (heap use-after-free).
• gh-98517: Port XKCP’s fix for the buffer overflows in SHA-3 to fix CVE-2022-37454.
• gh-98433: The IDNA codec decoder used on DNS hostnames by socket or asyncio related name resolution functions no longer involves a quadratic algorithm to fix CVE-2022-45061. This prevents a potential CPU denial of service if an out-of-spec excessive length hostname involving bidirectional characters were decoded. Some protocols such as urllib http 3xx redirects potentially allow for an attacker to supply such a name.
• gh-68966: The deprecated mailcap module now refuses to inject unsafe text (filenames, MIME types, parameters) into shell commands to address CVE-2015-20107. Instead of using such text, it will warn and act as if a match was not found (or for test commands, as if the test failed).
• gh-100001: python -m http.server no longer allows terminal control characters sent within a garbage request to be printed to the stderr server log.

No installers

According to the release calendar specified in PEP 537, Python 3.7 is now in the "security fixes only" stage of its life cycle: 3.7 branch only accepts security fixes and releases of those are made irregularly in source-only form until June 2023. Python 3.7 does not receive regular bug fixes anymore, and binary installers are no longer provided for it. Python 3.7.9 was the last full bugfix release of Python 3.7 with binary installers.

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