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.

HighFixed on 2 platforms

CVSS

7.0

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0037

30th percentile

<p>Integer overflow or wraparound in .NET Framework 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 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems		KB5120698	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 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 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

Details

Published
August 11, 2026
Weakness
Integer Overflow or Wraparound
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62897

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