High MSRC-CVE-2026-69304 1 CVE

ASP.NET Core Denial of Service Vulnerability

Published Sep 8, 2026 · Updated Sep 25, 2026 · Revision 2

Vendor: Microsoft

Summary

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

Details

Security updates
10.0.12 — https://support.microsoft.com/kb/5126106
9.0.20 — https://support.microsoft.com/kb/5126105
8.0.31 — https://support.microsoft.com/kb/5126104
18.9.3 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes
17.14.40 — https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes
9.0.20 — https://support.microsoft.com/help/5126105
10.0.12 — https://support.microsoft.com/help/5126106
8.0.31 — https://support.microsoft.com/help/5126104

Vulnerabilities 1

Medium 5.9

CVE-2026-69304

ASP.NET Core Denial of Service Vulnerability

Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Microsoft Microsoft Visual Studio 2022 version 17.14 .NET 9.0 runtime .NET 8.0 runtime Ubuntu Alpine Wolfi NuGet

Sep 8, 2026

Revision history

2026-09-25 #2
Security Updates table updated provide links to the KB articles and download center updates. Microsoft recommends installing the updates.
2026-09-08 #1
Information published.

References

CVE-2026-69304 ASP.NET Core Denial of Service Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304
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