Python 3.10.17

Release date: April 8, 2025

This is a security release of Python 3.10

Note: The release you're looking at is Python 3.10.17, a security bugfix release for the legacy 3.10 series. Python 3.13 is now the latest feature release series of Python 3. Get the latest release of 3.13.x here.

Security content in this release

• gh-131809: Upgrade vendored expat to 2.7.1
• gh-80222: Folding of quoted string in display_name violates RFC
• gh-121284: Invalid RFC 2047 address header after refolding with email.policy.default
• gh-131261: Update libexpat to 2.7.0
• gh-105704: CVE-2025-0938 urlparse does not flag hostname containing [ or ] as incorrect
• gh-119511: OOM vulnerability in the imaplib module

No installers

According to the release calendar specified in PEP 619, Python 3.10 is now in the "security fixes only" stage of its life cycle: 3.10 branch only accepts security fixes and releases of those are made irregularly in source-only form until October 2026. Python 3.10 isn't receiving regular bug fixes anymore, and binary installers are no longer provided for it. Python 3.10.11 was the last full bugfix release of Python 3.10 with binary installers.

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