critical9.1
CVE-2026-70188
Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to bypass a security feature o…
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | Microsoft.AspNetCore.App.Runtime.linux-arm | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-arm64 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-x64 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| nuget | Microsoft.AspNetCore.App.Runtime.osx-arm64 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| nuget | Microsoft.AspNetCore.App.Runtime.osx-x64 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-arm64 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-x64 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-x86 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | ASP.NET Core 8.0 | from 8.0 before 8.0.32 |
| Microsoft | ASP.NET Core 11.0 | from 11.0 before 11.0.0-rc.2 |
| Microsoft | Microsoft Visual Studio 2026 Version 18.10 | from 18.10.0 before 18.10.4 |
| Microsoft | ASP.NET Core 9.0 | from 9.0 before 9.0.21 |
| Microsoft | ASP.NET Core 10.0 | from 10.0 before 10.0.13 |
| Microsoft | Microsoft Visual Studio 2022 Version 17.14 | from 17.14.0 before 17.14.42 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-fpq8-4vhr-rcxx
- https://github.com/dotnet/aspnetcore/security/advisories/GHSA-fpq8-4vhr-rcxx
- https://github.com/dotnet/announcements/issues/462
- https://github.com/dotnet/aspnetcore/discussions/69798
- https://nvd.nist.gov/vuln/detail/CVE-2026-70188
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70188