When does .NET 11 support end?

.NET 11 is supported until November 14, 2028. The last six months before that are maintenance: security fixes only.

No. .NET 11 is a Standard Term Support (STS) release with two years of support. Even-numbered versions are LTS.

What C# version does .NET 11 use?

C# 15. It is the default language version for projects that target net11.0.

11.0.0, released November 10, 2026 (as of November 11, 2026). The latest SDK is 11.0.100.

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Release date	November 10, 2026
End of support	November 14, 2028
Release type	STS (Standard Term Support, 2 years)
Status	Active
C# version	C# 15 (the default for `net11.0`)
Target framework	`net11.0`
Latest version	11.0.0, released November 10, 2026
Latest SDK	`11.0.100`
ASP.NET Core and EF Core	ASP.NET Core 11 and EF Core 11 follow the same dates
Patches	0 patch releases after 11.0.0; 1 with security fixes (22 CVEs)

Version	Date	Security fixes	SDKs
11.0.0	2026-11-10	Yes: CVE-2026-114146, CVE-2026-109475, CVE-2026-114147, CVE-2026-105544, CVE-2026-114149, CVE-2026-114150, CVE-2026-114151, CVE-2026-114152, CVE-2026-109476, CVE-2026-109481, CVE-2026-118745, CVE-2026-114155, CVE-2026-114156, CVE-2026-70175, CVE-2026-118746, CVE-2026-118747, CVE-2026-114157, CVE-2026-114158, CVE-2026-114159, CVE-2026-118748, CVE-2026-118749, CVE-2026-120796	11.0.100