fkie_cve-2026-70188

2026-10-14T06:21:23.960097+00:00

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.

GHSA-fpq8-4vhr-rcxx — Microsoft Security Advisory CVE-2026-70188 - ASP.NET Core Security Feature Bypass Vulnerability

2026-10-14T06:21:23.960167+00:00

Affected: NuGet: 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 and 1 more

## Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Server.Kestrel.Core. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

Kestrel accepts newline characters in HTTP/2 request trailers and values retrieved from the dynamic HPACK table instead of treating them as malformed.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/462

## CVSS Details

- **Version:** 3.1 - **Severity:** Critical - **Score:** 9.1 - **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N` - **Weakness:** CWE-444 (Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'))

## Affected Platforms

- **Platforms:** Windows, Linux, macOS - **Architectures:** All

## Affected Packages

The vulnerability affects Microsoft .NET projects that use an affected package version listed below.

Package name | Affected version | Patched version ------------ | ---------------- | --------------- [Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm) | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 [Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64) | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 [Microsoft.Asp…

NCSC-2026-0423 — Kwetsbaarheden verholpen in Microsoft Windows

2026-10-14T06:21:23.960299+00:00

NCSC-2026-0423

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fkie_cve-2026-70188

GHSA-fpq8-4vhr-rcxx — Microsoft Security Advisory CVE-2026-70188 - ASP.NET Core Security Feature Bypass Vulnerability

NCSC-2026-0423 — Kwetsbaarheden verholpen in Microsoft Windows