Vulnerability · Published Sep 8, 2026 · Assigned by microsoft
CVE-2026-69304ASP.NET Core Denial of Service Vulnerability
Medium 5.9
In plain English
A medium-severity security flaw in ASP.NET Core 10.0 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.9%top 41.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | dotnet10-runtime | 10.0.13-r0 | ALPINE-CVE-2026-69304 |
| Alpine:v3.24 | dotnet10-runtime | 10.0.12-r0 | ALPINE-CVE-2026-69304 |
| Alpine:v3.22 | dotnet8-runtime | 8.0.31-r0 | ALPINE-CVE-2026-69304 |
| Alpine:v3.23 | dotnet8-runtime | 8.0.31-r0 | ALPINE-CVE-2026-69304 |
| Alpine:v3.24 | dotnet8-runtime | 8.0.31-r0 | ALPINE-CVE-2026-69304 |
| Alpine:v3.22 | dotnet9-runtime | 9.0.20-r0 | ALPINE-CVE-2026-69304 |
| Alpine:v3.23 | dotnet9-runtime | 9.0.20-r0 | ALPINE-CVE-2026-69304 |
| Alpine:v3.24 | dotnet9-runtime | 9.0.20-r0 | ALPINE-CVE-2026-69304 |
| NuGet | microsoft.aspnetcore.server.iisintegration | 10.0.12 | GHSA-8cp2-47hg-mfgh |
| NuGet | microsoft.aspnetcore.server.iisintegration | 11.0.0-rc.1 | GHSA-8cp2-47hg-mfgh |
| NuGet | microsoft.aspnetcore.server.iisintegration | 8.0.31 | GHSA-8cp2-47hg-mfgh |
| NuGet | microsoft.aspnetcore.server.iisintegration | 9.0.20 | GHSA-8cp2-47hg-mfgh |
| Ubuntu:22.04:LTS | dotnet7 | no fix listed | UBUNTU-CVE-2026-69304 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | .NET 10.0 runtime | 10.0.0 – before 10.0.12 |
| Microsoft | .NET 8.0 runtime | 8.0.0 – before 8.0.31 |
| Microsoft | .NET 9.0 runtime | 9.0.0 – before 9.0.20 |
| Microsoft | ASP.NET Core 10.0 | 10.0 – before 10.0.12 |
| Microsoft | ASP.NET Core 11.0 | 11.0 – before 11.0 RC1 |
| Microsoft | ASP.NET Core 8.0 | 8.0 – before 8.0.31 |
| Microsoft | ASP.NET Core 9.0 | 9.0 – before 9.0.20 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 – before 17.14.40 |
| Microsoft | Microsoft Visual Studio 2026 version 18.9 | 18.9.0 – before 18.9.3 |
Weakness: CWE-409 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
References
- ASP.NET Core Denial of Service Vulnerability vendor-advisory, patch