# KB5081278: March 2026 security update

KB5081278, released March 10, 2026, fixes 2 CVEs across 4 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/microsoft/kb5081278
- Platform: Microsoft
- Released: Mar 10, 2026
- Priority: High (Closes CVE-2026-26130, high severity)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5081278

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [.NET 9.0 runtime installed on Linux](https://patchblox.com/security/data/product/microsoft/net-9.0-runtime-installed-on-linux.md) |  |  |
| [.NET 9.0 runtime installed on Mac OS](https://patchblox.com/security/data/product/microsoft/net-9.0-runtime-installed-on-mac-os.md) |  |  |
| [.NET 9.0 runtime installed on Windows](https://patchblox.com/security/data/product/microsoft/net-9.0-runtime-installed-on-windows.md) |  |  |
| [ASP.NET Core 9.0](https://patchblox.com/security/data/product/microsoft/asp.net-core-9.0.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-26130](https://patchblox.com/security/data/cve/CVE-2026-26130.md) | High | ASP.NET Core | 7.5 | 0.0318 |  |
| [CVE-2026-26127](https://patchblox.com/security/data/cve/CVE-2026-26127.md) | High | .NET | 7.5 | 0.0227 | Disclosed |

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Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo