Flask v3.1.3 Release Notes
Release Date: 2026-02-19 // 4 months ago-
🚀 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
inandlen. GHSA-68rp-wp8r-4726
- 🔒 The session is marked as accessed for operations that only access the keys but not the values, such as
Previous changes from v3.1.2
-
🚀 This is the Flask 3.1.2 fix release, which fixes bugs 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/3.1.2/
🔄 Changes: https://flask.palletsprojects.com/page/changes/#version-3-1-2
Milestone: https://github.com/pallets/flask/milestone/38?closed=1