Microsoft · Security update · August 11, 2026
KB5122105: August 2026 security update
KB5122105, released August 11, 2026, fixes 9 CVEs across 3 products. None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
9
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0123
69th percentile
Priority of the 9 CVEs
Patch now 0
Urgent 0
High 8
Routine 1
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-2026-62901 | .NET | Denial of Service | 7.8 | 0.0123 | Exploitation Less Likely |
| High | CVE-2026-62898 | Microsoft QUIC | Information Disclosure | 7.5 | 0.0103 | Exploitation Less Likely |
| High | CVE-2026-62899 | .NET | Security Feature Bypass | 7.8 | 0.0075 | Exploitation Less Likely |
| High | CVE-2026-62900 | .NET | Information Disclosure | 7.8 | 0.0075 | Exploitation Less Likely |
| High | CVE-2026-62871 | .NET | Remote Code Execution | 7.8 | 0.0047 | Exploitation Less Likely |
| High | CVE-2026-62897 | .NET Framework | Remote Code Execution | 7.0 | 0.0037 | Exploitation Less Likely |
| High | CVE-2026-70354 | .NET | Remote Code Execution | 7.8 | 0.0036 | Exploitation Less Likely |
| High | CVE-2026-62909 | .NET | Elevation of Privilege | 7.8 | 0.0034 | Exploitation Unlikely |
| Routine | CVE-2026-62902 | .NET | Information Disclosure | 6.5 | 0.0087 | Exploitation Less Likely |
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