Microsoft Security Advisory CVE-2026-70159 - ASP.NET Core Denial of Service Vulnerability

[ Description ]Official description

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

[ Fixes ]Fixes and patches

• Microsoft.AspNetCore.SignalR.Common 10.0.13Fixed version · GitHub Advisories · nuget package Microsoft.AspNetCore.SignalR.Common: upgrade to 10.0.13 or later (affected >= 10.0.0, <= 10.0.12)
• Microsoft.AspNetCore.SignalR.Common 11.0.0-rc.2Fixed version · GitHub Advisories · nuget package Microsoft.AspNetCore.SignalR.Common: upgrade to 11.0.0-rc.2 or later (affected >= 11.0.0-preview.5, <= 11.0.0-rc.1)
• Microsoft.AspNetCore.SignalR.Common 8.0.32Fixed version · GitHub Advisories · nuget package Microsoft.AspNetCore.SignalR.Common: upgrade to 8.0.32 or later (affected >= 8.0.0, <= 8.0.31)
• Microsoft.AspNetCore.SignalR.Common 9.0.21Fixed version · GitHub Advisories · nuget package Microsoft.AspNetCore.SignalR.Common: upgrade to 9.0.21 or later (affected >= 9.0.0, <= 9.0.20)

[ Advisories ]Government CERT advisories

• CERT-FR14 Oct 2026CERTFR-2026-AVI-1316

  Multiple vulnerabilities in Microsoft products Translated from French

  Multiple vulnerabilities have been discovered in Microsoft products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-88086CVE-2026-70007CVE-2026-70179+141 more CVEs
• BSI CERT-Bund13 Oct 2026WID-SEC-2026-3893

  Microsoft Entwicklerwerkzeuge: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-96230CVE-2026-84008CVE-2026-102238+64 more CVEs
• NCSC-NL13 Oct 2026NCSC-2026-0426

  Vulnerabilities fixed in Microsoft Developer Tools Translated from Dutch

  Probability/damage M/HCVE-2026-58280CVE-2026-66822CVE-2026-69370+59 more CVEs

[ Packages ]Affected open-source packages

• Microsoft.AspNetCore.SignalR.Common nugetAffected >= 10.0.0, <= 10.0.12 · fixed in 10.0.13 · GHSA-334f-vvp4-7g6p
• Microsoft.AspNetCore.SignalR.Common nugetAffected >= 11.0.0-preview.5, <= 11.0.0-rc.1 · fixed in 11.0.0-rc.2 · GHSA-334f-vvp4-7g6p
• Microsoft.AspNetCore.SignalR.Common nugetAffected >= 8.0.0, <= 8.0.31 · fixed in 8.0.32 · GHSA-334f-vvp4-7g6p
• Microsoft.AspNetCore.SignalR.Common nugetAffected >= 9.0.0, <= 9.0.20 · fixed in 9.0.21 · GHSA-334f-vvp4-7g6p

[ References ]References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70159