CVE-2026-70188: Microsoft ASP.NET Core 10.0

Critical severity, CVSS 9.1. EPSS: 0.8% chance of exploitation in the next 30 days.

Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.

Affected products

• Microsoft ASP.NET Core 10.0: from 10.0, before 10.0.13 (fixed in 10.0.13)
• Microsoft ASP.NET Core 11.0: from 11.0, before 11.0.0-rc.2 (fixed in 11.0.0-rc.2)
• Microsoft ASP.NET Core 8.0: from 8.0, before 8.0.32 (fixed in 8.0.32)
• Microsoft ASP.NET Core 9.0: from 9.0, before 9.0.21 (fixed in 9.0.21)
• 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.App.Runtime.linux-arm (NuGet)
• Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet)
• Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet)
• Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet)
• Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet)
• Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet)
• Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet)
• Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet)
• Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet)
• Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet)
• Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet)

Published 2026-10-13. Last modified 2026-10-14.