CVE-2026-109478

ASP.NET Core Denial of Service Vulnerability

CVE-2026-109478 is fixed in 3 products on 1 platform, first by KB5135243, released November 10, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0125

69th percentile

<p>Inefficient algorithmic complexity in ASP.NET Core allows an unauthorized attacker to deny service over a network.</p>

Where it's fixed

Product	Fix	Released
Microsoft
.NET 8.0 installed on Linux	KB5135243	Nov 10, 2026
.NET 8.0 installed on Mac OS	KB5135243	Nov 10, 2026
.NET 8.0 installed on Windows	KB5135243	Nov 10, 2026

Details

Published
November 10, 2026
Weakness
Inefficient Algorithmic Complexity
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109478

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