CVE-2026-70354
.NET Core Remote Code Execution Vulnerability
CVE-2026-70354 is fixed in 62 products on 2 platforms, first by Microsoft .NET Windows Desktop Runtime 8.0 8.0.30, released July 23, 2026. 3 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: High.
HighFixed on 2 platforms
CVSS
7.8
Important
Exploitation
None reported
Exploitation Less Likely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0036
30th percentile
<p>Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.</p>
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Microsoft | |||
| .NET 10.0 runtime installed on Windows | KB5122106 | Aug 11, 2026 | |
| .NET 8.0 runtime installed on Windows | KB5122104 | Aug 11, 2026 | |
| .NET 9.0 runtime installed on Windows | KB5122105 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation) | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems | KB5120698 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems | KB5120698 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems | KB5120698 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 | KB5120698 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation) | KB5120698 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems | KB5120703 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for ARM64-based Systems | KB5120703 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems | KB5120703 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems | KB5120701 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems | KB5120701 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems | KB5120701 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems | KB5120701 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems | KB5120701 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for x64-based Systems | KB5120701 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 | KB5120703 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation) | KB5120703 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 | KB5120705 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 (Server Core installation) | KB5120705 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for 32-bit Systems | KB5120709 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems | KB5120709 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for x64-based Systems | KB5120709 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for 32-bit Systems | KB5120709 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for ARM64-based Systems | KB5120709 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for x64-based Systems | KB5120709 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for ARM64-based Systems | KB5120713 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for x64-based Systems | KB5120713 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for ARM64-based Systems | KB5120710 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for x64-based Systems | KB5120710 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for ARM64-based Systems | KB5120708 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for x64-based Systems | KB5120708 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 | KB5120714 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 (Server Core installation) | KB5120714 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 | KB5120708 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 (Server Core installation) | KB5120708 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 on Windows 11 Version 26H1 for ARM64-based Systems | KB5120747 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 on Windows 11 version 26H1 for x64-based Systems | KB5120747 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 on Windows Server 2012 | KB5120716 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 on Windows Server 2012 (Server Core installation) | KB5120716 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 on Windows Server 2012 R2 | KB5120695 | Aug 11, 2026 | |
| Microsoft .NET Framework 3.5 on Windows Server 2012 R2 (Server Core installation) | KB5120695 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 | KB5120699 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation) | KB5120699 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 | KB5120700 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation) | KB5120700 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems | KB5120702 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems | KB5120702 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.8 on Windows Server 2012 | KB5120704 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation) | KB5120704 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.8 on Windows Server 2012 R2 | KB5120706 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation) | KB5120706 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.8 on Windows Server 2016 | KB5120702 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation) | KB5120702 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems | KB5120711 | Aug 11, 2026 | |
| Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems | KB5120711 | Aug 11, 2026 | |
| Windows apps | |||
| Microsoft .NET Windows Desktop Runtime 8.0 | 8.0.30 | Microsoft .NET Windows Desktop Runtime 8.0 8.0.30 | Jul 23, 2026 |
| No fix yet | |||
| Microsoft Windows Desktop Runtime - 8.0.25 (arm64) (Windows apps) | No fix yet | no-fix | n/a |
| Microsoft Windows Desktop Runtime - 8.0.25 (x64) (Windows apps) | No fix yet | no-fix | n/a |
| Microsoft Windows Desktop Runtime - 8.0.25 (x86) (Windows apps) | No fix yet | no-fix | n/a |
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