When does .NET 9 support end?

.NET 9 is supported until November 10, 2026. The last six months before that are maintenance: security fixes only.

No. .NET 9 is a Standard Term Support (STS) release with two years of support. Even-numbered versions are LTS.

What C# version does .NET 9 use?

C# 13. It is the default language version for projects that target net9.0.

What is the latest .NET 9 version?

9.0.20, released September 8, 2026 (as of September 26, 2026). The latest SDK is 9.0.318.

.NET 9 End of Life: November 10, 2026

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Release date	November 12, 2024
End of support	November 10, 2026
Release type	STS (Standard Term Support, 2 years)
Status	Maintenance
C# version	C# 13 (the default for `net9.0`)
Target framework	`net9.0`
Latest version	9.0.20, released September 8, 2026
Latest SDK	`9.0.318`; per feature band: 9.0.3xx `9.0.318`, 9.0.2xx `9.0.205`, 9.0.1xx `9.0.121`
ASP.NET Core and EF Core	ASP.NET Core 9 and EF Core 9 follow the same dates
Patches	20 patch releases after 9.0.0; 15 with security fixes (60 CVEs)

Version	Date	Security fixes	SDKs
9.0.20	2026-09-08	Yes: CVE-2026-69439, CVE-2026-71328, CVE-2026-69522, CVE-2026-69304, CVE-2026-58649, CVE-2026-69806	9.0.318, 9.0.121
9.0.19	2026-08-11	Yes: CVE-2026-62898, CVE-2026-62899, CVE-2026-62900, CVE-2026-62901, CVE-2026-62886, CVE-2026-62871, CVE-2026-70354, CVE-2026-62902, CVE-2026-62897, CVE-2026-62909	9.0.317, 9.0.120
9.0.18	2026-07-14	Yes: CVE-2026-50651, CVE-2026-50526, CVE-2026-50524, CVE-2026-50646, CVE-2026-50649, CVE-2026-50650, CVE-2026-56158, CVE-2026-47302, CVE-2026-50648, CVE-2026-50527, CVE-2026-47304, CVE-2026-50525, CVE-2026-57108, CVE-2026-50528, CVE-2026-50659, CVE-2026-47300, CVE-2026-47303	9.0.316, 9.0.119
9.0.17	2026-06-09	Yes: CVE-2026-45591, CVE-2026-45491, CVE-2026-45490	9.0.315, 9.0.118
9.0.16	2026-05-12	Yes: CVE-2026-32177, CVE-2026-35433, CVE-2026-32175, CVE-2026-42899	9.0.314, 9.0.117
9.0.15	2026-04-14	Yes: CVE-2026-26171, CVE-2026-32203, CVE-2026-33116, CVE-2026-32178	9.0.313, 9.0.116
9.0.14	2026-03-10	Yes: CVE-2026-26130, CVE-2026-26127	9.0.312, 9.0.115
9.0.13	2026-02-10	Yes: CVE-2026-21218	9.0.311, 9.0.114
9.0.12	2026-01-20	No	9.0.310, 9.0.309, 9.0.113
9.0.11	2025-11-19	No	9.0.308, 9.0.307, 9.0.112
9.0.10	2025-10-14	Yes: CVE-2025-55247, CVE-2025-55315, CVE-2025-55248	9.0.306, 9.0.111
9.0.9	2025-09-09	No	9.0.305, 9.0.110
9.0.8	2025-08-05	No	9.0.304, 9.0.109
9.0.7	2025-07-17	No	9.0.303, 9.0.302, 9.0.108
9.0.6	2025-06-10	Yes: CVE-2025-30399	9.0.301, 9.0.205, 9.0.107
9.0.5	2025-05-13	Yes: CVE-2025-26646	9.0.300, 9.0.204, 9.0.106
9.0.4	2025-04-08	Yes: CVE-2025-26682	9.0.203, 9.0.105
9.0.3	2025-03-11	Yes: CVE-2025-24070	9.0.202, 9.0.201, 9.0.104
9.0.2	2025-02-11	No	9.0.200, 9.0.103
9.0.1	2025-01-14	Yes: CVE-2025-21171, CVE-2025-21172, CVE-2025-21176, CVE-2025-21173	9.0.102
9.0.0	2024-12-03	Yes: CVE-2024-43498, CVE-2024-43499	9.0.101, 9.0.100

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