Microsoft · Security update · February 10, 2026
KB5077864: February 2026 security update
KB5077864, released February 10, 2026, fixes 1 CVE across 3 products. None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
1
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0100
62nd percentile
Applies to
| Product |
|---|
| .NET 9.0 runtime installed on Linux |
| .NET 9.0 runtime installed on Mac OS |
| .NET 9.0 runtime installed on Windows |
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| High | CVE-2026-21218 | .NET | Spoofing | 7.5 | 0.0100 | Exploitation Unlikely |
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