CVE-2026-25667

Microsoft .NET Windows Desktop Runtime 8.0: Uncontrolled Resource Consumption

CVE-2026-25667 is fixed in Microsoft .NET Windows Desktop Runtime 8.0 on 1 platform by Microsoft .NET Windows Desktop Runtime 8.0 8.0.23 (version 8.0.23), released December 9, 2025. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0319

88th percentile

ASP.NET Core Kestrel in Microsoft .NET 8.0 before 8.0.22 and .NET 9.0 before 9.0.11 allows a remote attacker to cause excessive CPU consumption by sending a crafted QUIC packet, because of an incorrect exit condition for HTTP/3 Encoder/Decoder stream processing.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
Microsoft .NET Windows Desktop Runtime 8.0	8.0.23	Microsoft .NET Windows Desktop Runtime 8.0 8.0.23	Dec 9, 2025

Details

Published
March 19, 2026
Weakness
CWE-400: Uncontrolled Resource Consumption
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-25667

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