High MSRC-CVE-2026-45591 1 CVE

ASP.NET Core Denial of Service Vulnerability

Published Jun 9, 2026 · Updated Jun 9, 2026

Vendor: Microsoft

Summary

Impact: Denial of Service. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

Security updates
18.6.3 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes
10.0.9 — https://support.microsoft.com/help/5097148
8.0.28 — https://support.microsoft.com/help/5097149
9.0.17 — https://support.microsoft.com/help/5097150

Vulnerabilities 1

High 7.5

CVE-2026-45591

ASP.NET Core Denial of Service Vulnerability

Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Microsoft .NET 9.0 runtime .NET 10.0 runtime .NET 8.0 runtime Ubuntu Alpine Wolfi NuGet

Jun 9, 2026

Revision history

2026-06-09 #1
Information published.

References

CVE-2026-45591 ASP.NET Core Denial of Service Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45591
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss