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Flask Releases

Python backend framework updates

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Last checked 13 Oct 2026, 18:24 GMT+2

Latest updates

Latest: 3.1.3 · 19 Feb 2026 - This is the Flask 3.1.3 security fix release, which fixes a security issue but does not otherwise change behavior and should not result in breaking changes compared to the latest feature release. PyPI: https://pypi.org/project/Flask/3.1.3/ Changes: https://flask.palletsprojects.com/page/changes/#version-3-1-3 The session is marked as accessed for operations that only access the keys but not the values, such as in and len . GHSA-68rp-wp8r-4726

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pythonbackendframeworkopen-source
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Flask

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