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KB5097149: what it fixes and who gets it

KB5097149 is a security update from Microsoft's June 2026 release for .NET 8.0, .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS and other products.

Microsoft data read
3CVEs fixed
0rated Critical
0already exploited
Norestart required

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 KB5097149

CVETypeCVSSSeverity
CVE-2026-45490.NET SDK Elevation of Privilege VulnerabilityElevation of Privilege7.8Important
CVE-2026-45591ASP.NET Core Denial of Service VulnerabilityDenial of Service7.5Important
CVE-2026-45491.NET Tampering VulnerabilityTampering6.2Important

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