Compatibility result
Flask 2+Python 3.9
Why?
Why is Flask 2 compatible with Python 3.9?
- Requirement
- Python >=3.8
- Selected version
- Python 3.9
- Evaluation
- 3.9.25 satisfies >=3.8
- Conclusion
- COMPATIBLE
Evidence
CompatHub reports compatibility from upstream sources rather than making unsupported claims of its own.
Flask PyPI releases
Confidence: HIGHhttps://pypi.org/pypi/Flask/2.3.3/json
Retrieved 2 September 2026
Requirement: >=3.8
Python versions
Compatibility is derived from the project's declared Python requirement (>=3.8); it does not mean every version combination has been independently tested.
Other Python versions satisfying this requirement
Flask 2 — compatible Python lines tracked in CompatHub
- ✓Python 3.8version lineEOL
- ✓Python 3.9version lineEOL
- ✓Python 3.10version linesupported
- ✓Python 3.11version linesupported
- ✓Python 3.12version linesupported
- ✓Python 3.13version linesupported
- ✓Python 3.14version linesupported
- ✓Python 3.15version line
- ✓Python 3.16version line
Other Flask versions
Only lines with relevant compatibility evidence are listed.
Lifecycle context
Lifecycle status is separate from compatibility. An EOL component can still satisfy a documented version requirement.
Compatible, but past end of life
These versions satisfy the documented compatibility requirement, but one or more components are past end of life. Python 3.9 lifecycle
- Status
- STANDARD SUPPORT
- Status
- END OF LIFE
- EOL
- 31 October 2025
Security context
Compatibility, lifecycle, and security are separate dimensions.
- Flask 2: 4 tracked advisories for this line. View details →
- Python 3.9: 21 tracked advisories for this line. View details →
CompatHub does not invent vulnerability data.
Supported alternatives
Python lines that satisfy this requirement and are still supported.
- Python 3.10supported
- Python 3.11supported
- Python 3.12supported
- Python 3.13supported
- Python 3.14supported