CVE-2026-70159: Microsoft Microsoft.aspnetcore.signalr.common

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

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

Affected products

• Microsoft Microsoft.aspnetcore.signalr.common: from 10.0.0, before 10.0.13 (fixed in 10.0.13)
• Microsoft Microsoft.aspnetcore.signalr.core: from 1.0.0, before 1.2.14 (fixed in 1.2.14)
• Microsoft Microsoft Visual Studio 2022 Version 17.14: from 17.14.0, before 17.14.42 (fixed in 17.14.42)
• Microsoft Microsoft Visual Studio 2026 Version 18.10: from 18.10.0, before 18.10.4 (fixed in 18.10.4)

Affected packages

• Microsoft.AspNetCore.SignalR.Common (NuGet)
• Microsoft.AspNetCore.SignalR.Core (NuGet)

Published 2026-10-13. Last modified 2026-10-13.