KB5122106: what it fixes and who gets it
KB5122106 is a security update from Microsoft's August 2026 release for .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows.
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Should you install it?
Yes. It is a routine security update; none of its fixes are rated Critical or reported as exploited. Windows Update installs it automatically on supported home PCs.
If the installation fails or the PC misbehaves afterwards, note the exact error code first: the fix depends on it. Our update troubleshooting guides are linked on this page.
Security fixes in KB5122106
| CVE | Type | CVSS | Severity |
|---|---|---|---|
| CVE-2026-62886.NET Elevation of Privilege Vulnerability | Elevation of Privilege | 7.8 | Important |
| CVE-2026-62909.NET Elevation of Privilege Vulnerability | Elevation of Privilege | 7.8 | Important |
| CVE-2026-70354.NET Core Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-62898Microsoft QUIC Information Disclosure Vulnerability | Information Disclosure | 7.5 | Important |
| CVE-2026-62901.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-62897.NET Framework Remote Code Execution Vulnerability | Remote Code Execution | 7.0 | Important |
| CVE-2026-62899.NET Security Feature Bypass Vulnerability | Security Feature Bypass | 5.9 | Important |
| CVE-2026-62900.NET Information Disclosure Vulnerability | Information Disclosure | 5.9 | Important |
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