CVE-2026-58641

.NET Elevation of Privilege Vulnerability

CVE-2026-58641 is fixed in Microsoft .NET Windows Desktop Runtime 8.0 on 1 platform by Microsoft .NET Windows Desktop Runtime 8.0 8.0.30 (version 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.

High

CVSS

7.8

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0047

40th percentile

<p>Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.</p>

Where it's fixed

Product	Fixed in	Fix	Released
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-2026-58641

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