# CVE-2026-62897: .NET Framework Remote Code Execution Vulnerability

CVE-2026-62897 is fixed in 10 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-62897
- Priority: High
- CVSS: 7.0 (Important)
- EPSS: 0.0037
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Aug 11, 2026
- Weakness: Integer Overflow or Wraparound
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62897

## Description

<p>Integer overflow or wraparound in .NET Framework allows an unauthorized attacker to execute code locally.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | .NET 10.0 runtime installed on Windows |  | [KB5122106](https://patchblox.com/security/data/fix/microsoft/kb5122106.md) | Aug 11, 2026 |
| Microsoft | .NET 8.0 runtime installed on Windows |  | [KB5122104](https://patchblox.com/security/data/fix/microsoft/kb5122104.md) | Aug 11, 2026 |
| Microsoft | .NET 9.0 runtime installed on Windows |  | [KB5122105](https://patchblox.com/security/data/fix/microsoft/kb5122105.md) | Aug 11, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems |  | [KB5120698](https://patchblox.com/security/data/fix/microsoft/kb5120698.md) | Aug 11, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for ARM64-based Systems |  | [KB5120703](https://patchblox.com/security/data/fix/microsoft/kb5120703.md) | Aug 11, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 on Windows 11 Version 26H1 for ARM64-based Systems |  | [KB5120747](https://patchblox.com/security/data/fix/microsoft/kb5120747.md) | Aug 11, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 on Windows 11 version 26H1 for x64-based Systems |  | [KB5120747](https://patchblox.com/security/data/fix/microsoft/kb5120747.md) | Aug 11, 2026 |
| Microsoft | Microsoft .NET Framework 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems |  | [KB5120711](https://patchblox.com/security/data/fix/microsoft/kb5120711.md) | Aug 11, 2026 |
| Microsoft | Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems |  | [KB5120711](https://patchblox.com/security/data/fix/microsoft/kb5120711.md) | 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](https://patchblox.com/security/data/fix/windows-app/microsoft.dotnet.desktopruntime.8-8.0.30.md) | Jul 23, 2026 |

## No fix yet

| Platform | Product | Status |
|---|---|---|
| Windows apps | Microsoft Windows Desktop Runtime - 8.0.25 (arm64) | no-fix |
| Windows apps | Microsoft Windows Desktop Runtime - 8.0.25 (x64) | no-fix |
| Windows apps | Microsoft Windows Desktop Runtime - 8.0.25 (x86) | no-fix |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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