What is CVE-2026-69304?

CVE-2026-69304 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. ASP.NET Core Denial of Service Vulnerability

Which CVE IDs does CVE-2026-69304 cover?

CVE-2026-69304 covers the following CVE IDs: CVE-2026-69304. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-69304?

CVE-2026-69304 has a CVSS v3 base score of 5.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-69304?

CVE-2026-69304 affects 9 products, including: .NET 10.0 installed on Windows; .NET 8.0 installed on Windows; .NET 9.0 installed on Windows; ASP.NET Core 10.0; ASP.NET Core 11.0; and others — see the full list on the advisory page.

CVE-2026-69304HighCVSS 5.9

ASP.NET Core Denial of Service Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

September 11, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-69304 →

📋 Description

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

🎯 Affected products9

.NET 10.0 installed on Windows
.NET 8.0 installed on Windows
.NET 9.0 installed on Windows
ASP.NET Core 10.0
ASP.NET Core 11.0
ASP.NET Core 8.0
ASP.NET Core 9.0
Microsoft Visual Studio 2022 version 17.14
Microsoft Visual Studio 2026 version 18.9

✅ Remediation

Security Update — fixed build 11.0 RC1 KB5126106 (Security Update) — fixed build 10.0.12 KB5126105 (Security Update) — fixed build 9.0.20 KB5126104 (Security Update) — fixed build 8.0.31 KBRelease Notes (Security Update) — fixed build 18.9.3 KBRelease Notes (Security Update) — fixed build 17.14.40

🔗 References (15)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304
patchhttps://dotnet.microsoft.com/download/dotnet/11.0
patchhttps://dotnet.microsoft.com/download/dotnet/10.0
referencehttps://support.microsoft.com/kb/5126106
patchhttps://dotnet.microsoft.com/download/dotnet/9.0
referencehttps://support.microsoft.com/kb/5126105
patchhttps://dotnet.microsoft.com/download/dotnet/8.0
referencehttps://support.microsoft.com/kb/5126104
patchhttps://www.catalog.update.microsoft.com/Search.aspx?q=Visual Studio 2026 18.9.3
referencehttps://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes
patchhttps://www.catalog.update.microsoft.com/Search.aspx?q=Visual Studio 2022 17.14.40
referencehttps://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes
referencehttps://support.microsoft.com/help/5126105
referencehttps://support.microsoft.com/help/5126106
referencehttps://support.microsoft.com/help/5126104