High MSRC-CVE-2026-70159 1 CVE

ASP.NET Core Denial of Service Vulnerability

Published Oct 13, 2026 · Updated Oct 15, 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
10.0.13 — https://github.com/dotnet/announcements/issues/452
18.10.4 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes
17.14.42 — https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes

Vulnerabilities 1

High 7.5

CVE-2026-70159

ASP.NET Core Denial of Service Vulnerability

Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Microsoft Microsoft Visual Studio 2022 version 17.14 Microsoft Visual Studio 2026 version 18.10 Microsoft.AspNetCore.SignalR.Core Ubuntu Alpine Wolfi NuGet

Oct 13, 2026

Revision history

2026-10-15 #2
Updated the Security Updates table to add KB article links for .NET 11.0 and download and KB article links for Microsoft Visual Studio. This is an informational change only; the fixed builds are unchanged.
2026-10-13 #1
Information published.

References

CVE-2026-70159 ASP.NET Core Denial of Service Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70159
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