.NET 9 · Version Status
.NET 9 End of Life Date
.NET 9 end-of-life date, support status, and CVE risk. Data reconciled from official vendor documentation and endoflife.date at every build; the source of each date is on the product page.
⚡
.NET 9 reaches end of life on November 10, 2026. Plan your migration now — 3 days remaining.
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EOL Date
Nov 10, 2026
3 days remaining
Latest Release
9.0.21
Standard release
Release Date
Nov 12, 2024
.NET 9 series
Where these dates come from
End of lifeNov 10, 2026Vendor's own page, read by our adapter · builds.dotnet.microsoft.com · checked Nov 3, 2026high · 3 sources agree ReleaseNov 12, 2024Vendor's own page, checked by a person · learn.microsoft.com · checked Sep 17, 2026high · 2 sources agree Confidence: high = two or more independent sources agree (the vendor's page read by our adapter, a person's check against the vendor, the dataset the date came from); medium = one; low = the vendor page disagrees or our last read is stale.
How we source dates.
Lifecycle detail
.NET 9 was released on November 12, 2024 and support is scheduled to end on November 10, 2026 — a planned supported lifespan of 2 years, shorter than the 2 years and 7 months median for .NET releases. It is not an LTS release; .NET reserves longer patch windows for its LTS releases. Its most recent patch is 9.0.21, published October 13, 2026.
Attack Surface
30/30 Critical tier
CISA KEV Exposure
20/20 Named in CISA KEV
Extended Support
0/10 Available
EOL Risk Score™ — proprietary methodology by endoflife.ai. Factors: EOL recency, attack surface breadth, CISA KEV catalog presence, extended support availability. Updated at every build.
Methodology → ·
View score card →
| Version | Latest | EOL Date | Status |
|---|
| Core 1.0 LTS |
1.0.16 |
Jun 27, 2019 |
EOL |
| Core 1.1 LTS |
1.1.13 |
Jun 27, 2019 |
EOL |
| Core 2.0 |
2.0.9 |
Oct 1, 2018 |
EOL |
| Core 2.1 LTS |
2.1.30 |
Aug 21, 2021 |
EOL |
| Core 2.2 |
2.2.8 |
Dec 23, 2019 |
EOL |
| Core 3.0 |
3.0.3 |
Mar 3, 2020 |
EOL |
| Core 3.1 LTS |
3.1.32 |
Dec 13, 2022 |
EOL |
| 5 |
5.0.17 |
May 10, 2022 |
EOL |
What does .NET 9 end of life mean?
When .NET 9 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: A CVE-based scan does not show the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. Running .NET 9 past its EOL date creates a growing attack surface that a clean scan result does not rule out.
Migrate to .NET 10 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does .NET 9 reach end of life?
.NET 9 reaches end of life on November 10, 2026. That is 3 days remaining.
Is .NET 9 still supported?
.NET 9 is still supported but approaching end of life on November 10, 2026. Begin planning your migration now.
What should I upgrade to from .NET 9?
The recommended upgrade from .NET 9 is
.NET 10 — the latest actively supported version. Check the
.NET full timeline for all supported versions.
What are the security risks of running .NET 9 past EOL?
When .NET 9 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no vendor fix. A CVE-based scan does not show this — it is the CVE blind spot; some scanners flag unsupported versions of common products, but coverage varies and none give the date in advance. Organizations running EOL .NET should migrate immediately or implement compensating controls.