CVE-2026-87697

.NET Remote Code Execution Vulnerability

CVE-2026-87697 is fixed in 9 products on 2 platforms, first by Microsoft .NET Windows Desktop Runtime 10.0 10.0.13, released October 4, 2026. 3 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: High.

HighFixed on 2 platforms

CVSS

8.8

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0084

58th percentile

<p>Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
.NET 10.0 runtime installed on Windows		KB5130036	Oct 13, 2026
.NET 8.0 runtime installed on Windows		KB5130034	Oct 13, 2026
.NET 9.0 runtime installed on Windows		KB5130035	Oct 13, 2026
Windows apps
Microsoft .NET Windows Desktop Runtime 10.0	10.0.13	Microsoft .NET Windows Desktop Runtime 10.0 10.0.13	Oct 4, 2026
Microsoft .NET Windows Desktop Runtime 8.0	8.0.32	Microsoft .NET Windows Desktop Runtime 8.0 8.0.32	Oct 5, 2026
Microsoft .NET Windows Desktop Runtime 9.0	9.0.21	Microsoft .NET Windows Desktop Runtime 9.0 9.0.21	Oct 5, 2026
Microsoft ASP.NET Core Hosting Bundle 10.0	10.0.13	Microsoft ASP.NET Core Hosting Bundle 10.0 10.0.13	Oct 5, 2026
Microsoft ASP.NET Core Hosting Bundle 8.0	8.0.32	Microsoft ASP.NET Core Hosting Bundle 8.0 8.0.32	Oct 5, 2026
Microsoft ASP.NET Core Hosting Bundle 9.0	9.0.21	Microsoft ASP.NET Core Hosting Bundle 9.0 9.0.21	Oct 5, 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
October 13, 2026
Weakness
Deserialization of Untrusted Data
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87697

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