CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-109478 ASP.NET Core Denial of Service Vulnerability
High (7.5) in microsoft. EPSS 1.2% estimated probability of exploitation activity in the next 30 days. Fixed in Microsoft.AspNetCore.App.Runtime.linux-arm 8.0.34, 9.0.0-preview.4.24267.6.
On this page
Inefficient algorithmic complexity in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Severity
- EPSS
- 1.2% estimated probability of exploitation activity in the next 30 days; 70th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: yes · Technical impact: partial, assessed 2026-11-10. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-407 Inefficient Algorithmic Complexity
- Published
- Modified
- Assigned by
- microsoft (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
- microsoft:.net 8.0 installed on linux
- microsoft:.net 8.0 installed on mac os
- microsoft:.net 8.0 installed on windows
- microsoft:.net 9.0 installed on linux
- microsoft:.net 9.0 installed on mac os
- microsoft:.net 9.0 installed on windows
- microsoft:microsoft visual studio 2022 version 17.14
- microsoft:microsoft visual studio 2026 version 18.11
- microsoft:microsoft visual studio 2026 version 18.12
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| Microsoft .NET 8.0 installed on Linux | from 8.0.0 before 8.0.34 |
| Microsoft .NET 8.0 installed on Mac OS | from 8.0.0 before 8.0.34 |
| Microsoft .NET 8.0 installed on Windows | from 8.0.0 before 8.0.34 |
| Microsoft .NET 9.0 installed on Linux | from 9.0.0 before 9.0.0-preview.4.24266.19 |
| Microsoft .NET 9.0 installed on Mac OS | from 9.0.0 before 9.0.0-preview.4.24266.19 |
| Microsoft .NET 9.0 installed on Windows | from 9.0.0 before 9.0.0-preview.4.24266.19 |
| Microsoft Visual Studio 2022 version 17.14 | from 17.14.0 before 17.14.45 |
| Microsoft Visual Studio 2026 version 18.11 | from 18.11.0 before 18.11.4 |
| Microsoft Visual Studio 2026 version 18.12 | from 18.12.0 before 18.12.0 |
Fix and patched versions
Microsoft.AspNetCore.App.Runtime.linux-arm(NuGet): fixed in 8.0.34, 9.0.0-preview.4.24267.6Microsoft.AspNetCore.App.Runtime.linux-arm64(NuGet): fixed in 8.0.34, 9.0.0-preview.4.24267.6Microsoft.AspNetCore.App.Runtime.linux-musl-arm(NuGet): fixed in 8.0.34, 9.0.0-preview.4.24267.6Microsoft.AspNetCore.App.Runtime.linux-musl-arm64(NuGet): fixed in 8.0.34, 9.0.0-preview.4.24267.6Microsoft.AspNetCore.App.Runtime.linux-musl-x64(NuGet): fixed in 8.0.34, 9.0.0-preview.4.24267.6Microsoft.AspNetCore.App.Runtime.linux-x64(NuGet): fixed in 8.0.34, 9.0.0-preview.4.24267.6Microsoft.AspNetCore.App.Runtime.osx-arm64(NuGet): fixed in 8.0.34, 9.0.0-preview.4.24267.6Microsoft.AspNetCore.App.Runtime.osx-x64(NuGet): fixed in 8.0.34, 9.0.0-preview.4.24267.6- Ubuntu, Red Hat, AlmaLinux, Rocky Linux, Alpine: fixed package versions per release
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-arm | >=8.0.0-preview.1.23112.2 <8.0.34 | 8.0.34 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-arm64 | >=8.0.0-preview.1.23112.2 <8.0.34 | 8.0.34 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >=8.0.0-preview.1.23112.2 <8.0.34 | 8.0.34 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >=8.0.0-preview.1.23112.2 <8.0.34 | 8.0.34 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >=8.0.0-preview.1.23112.2 <8.0.34 | 8.0.34 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-x64 | >=8.0.0-preview.1.23112.2 <8.0.34 | 8.0.34 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.osx-arm64 | >=8.0.0-preview.1.23112.2 <8.0.34 | 8.0.34 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.osx-x64 | >=8.0.0-preview.1.23112.2 <8.0.34 | 8.0.34 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-arm64 | >=8.0.0-preview.1.23112.2 <8.0.34 | 8.0.34 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-x64 | >=8.0.0-preview.1.23112.2 <8.0.34 | 8.0.34 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-x86 | >=8.0.0-preview.1.23112.2 <8.0.34 | 8.0.34 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-arm | >=9.0.0-preview.1.24081.5 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-arm | >=9.0.0-preview.2.24128.4 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-arm | >=9.0.0-preview.3.24172.13 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-arm64 | >=9.0.0-preview.1.24081.5 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-arm64 | >=9.0.0-preview.2.24128.4 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-arm64 | >=9.0.0-preview.3.24172.13 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >=9.0.0-preview.1.24081.5 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >=9.0.0-preview.2.24128.4 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >=9.0.0-preview.3.24172.13 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >=9.0.0-preview.1.24081.5 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >=9.0.0-preview.2.24128.4 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >=9.0.0-preview.3.24172.13 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >=9.0.0-preview.1.24081.5 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >=9.0.0-preview.2.24128.4 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >=9.0.0-preview.3.24172.13 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-x64 | >=9.0.0-preview.1.24081.5 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-x64 | >=9.0.0-preview.2.24128.4 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.linux-x64 | >=9.0.0-preview.3.24172.13 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.osx-arm64 | >=9.0.0-preview.1.24081.5 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.osx-arm64 | >=9.0.0-preview.2.24128.4 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.osx-arm64 | >=9.0.0-preview.3.24172.13 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.osx-x64 | >=9.0.0-preview.1.24081.5 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.osx-x64 | >=9.0.0-preview.2.24128.4 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.osx-x64 | >=9.0.0-preview.3.24172.13 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-arm64 | >=9.0.0-preview.1.24081.5 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-arm64 | >=9.0.0-preview.2.24128.4 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-arm64 | >=9.0.0-preview.3.24172.13 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-x64 | >=9.0.0-preview.1.24081.5 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-x64 | >=9.0.0-preview.2.24128.4 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-x64 | >=9.0.0-preview.3.24172.13 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-x86 | >=9.0.0-preview.1.24081.5 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-x86 | >=9.0.0-preview.2.24128.4 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
| GHSA-r3qf-p3jm-8h4p | NuGet | Microsoft.AspNetCore.App.Runtime.win-x86 | >=9.0.0-preview.3.24172.13 <9.0.0-preview.4.24267.6 | 9.0.0-preview.4.24267.6 |
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Ubuntu | 22.04:LTS | dotnet6, dotnet7 | no fix listed | UBUNTU-CVE-2026-109478 |
| Ubuntu | 22.04:LTS | dotnet8 | 8.0.134-8.0.34-0ubuntu1~22.04.1 | UBUNTU-CVE-2026-109478 USN-9042-1 |
| Ubuntu | 24.04:LTS | dotnet10 | 10.0.115-10.0.15-0ubuntu1~24.04.1 | USN-9042-1 |
| Ubuntu | 24.04:LTS | dotnet8 | 8.0.134-8.0.34-0ubuntu1~24.04.1 | UBUNTU-CVE-2026-109478 USN-9042-1 |
| Ubuntu | 26.04:LTS | dotnet10 | 10.0.115-10.0.15-0ubuntu1~26.04.1 | USN-9042-1 |
| Ubuntu | 26.10 | dotnet10 | 10.0.115-10.0.15-0ubuntu1~26.10.1 | USN-9042-1 |
| Ubuntu | 26.10 | dotnet11 | 11.0.100-11.0.0-0ubuntu1~26.10.1 | USN-9042-1 |
| Red Hat | enterprise_linux:8::appstream | dotnet-hostfxr-8.0, dotnet-runtime-8.0, aspnetcore-runtime-8.0 and 8 more | 0:8.0.34-1.el8_10 | RHSA-2026:99052 |
| Red Hat | enterprise_linux:8::appstream | dotnet8.0, dotnet-sdk-8.0, dotnet-sdk-dbg-8.0 and 4 more | 0:8.0.134-1.el8_10 | RHSA-2026:99052 |
| Red Hat | enterprise_linux:8::crb | dotnet-hostfxr-8.0-debuginfo, dotnet-runtime-8.0-debuginfo, dotnet-apphost-pack-8.0-debuginfo | 0:8.0.34-1.el8_10 | RHSA-2026:99052 |
| Red Hat | enterprise_linux:8::crb | dotnet8.0-debuginfo, dotnet8.0-debugsource, dotnet-sdk-8.0-debuginfo and 1 more | 0:8.0.134-1.el8_10 | RHSA-2026:99052 |
| Red Hat | enterprise_linux:9::appstream | dotnet-hostfxr-8.0, dotnet-runtime-8.0, aspnetcore-runtime-8.0 and 8 more | 0:8.0.34-1.el9_9 | RHSA-2026:99146 |
| Red Hat | enterprise_linux:9::appstream | dotnet8.0, dotnet-sdk-8.0, dotnet-sdk-dbg-8.0 and 4 more | 0:8.0.134-1.el9_9 | RHSA-2026:99146 |
| Red Hat | enterprise_linux:9::crb | dotnet-hostfxr-8.0-debuginfo, dotnet-runtime-8.0-debuginfo, dotnet-apphost-pack-8.0-debuginfo | 0:8.0.34-1.el9_9 | RHSA-2026:99146 |
| Red Hat | enterprise_linux:9::crb | dotnet8.0-debuginfo, dotnet8.0-debugsource, dotnet-sdk-8.0-debuginfo and 1 more | 0:8.0.134-1.el9_9 | RHSA-2026:99146 |
| Red Hat | enterprise_linux:10.3 | dotnet-hostfxr-8.0, dotnet-runtime-8.0, aspnetcore-runtime-8.0 and 8 more | 0:8.0.34-1.el10_3 | RHSA-2026:99147 |
| Red Hat | enterprise_linux:10.3 | dotnet8.0, dotnet-sdk-8.0, dotnet-sdk-dbg-8.0 and 4 more | 0:8.0.134-1.el10_3 | RHSA-2026:99147 |
| AlmaLinux | 8 | dotnet-hostfxr-8.0, dotnet-runtime-8.0, aspnetcore-runtime-8.0 and 5 more | 8.0.34-1.el8_10 | ALSA-2026:99052 |
| AlmaLinux | 8 | dotnet-sdk-8.0, dotnet-sdk-dbg-8.0, dotnet-templates-8.0 and 1 more | 8.0.134-1.el8_10 | ALSA-2026:99052 |
| Rocky Linux | 8 | dotnet-hostfxr-8.0, dotnet-runtime-8.0, aspnetcore-runtime-8.0 and 8 more | 0:8.0.34-1.el8_10 | RLSA-2026:99052 |
| Rocky Linux | 8 | dotnet-sdk-8.0, dotnet-sdk-dbg-8.0, dotnet8.0-debuginfo and 4 more | 0:8.0.134-1.el8_10 | RLSA-2026:99052 |
| Alpine | v3.22, v3.23, v3.24 | dotnet8-runtime | 8.0.34-r0 | ALPINE-CVE-2026-109478 |
From the distributions' data via OSV.dev: Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; Red Hat Security Data © Red Hat, Inc., CC BY 4.0; AlmaLinux's OSV database, MIT; Rocky Linux's errata, BSD-3-Clause; the Alpine secdb, CC BY-SA 4.0. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Ubuntu · Red Hat · Alpine.
Red Hat
Red Hat rates this Important.
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | dotnet8.0-0:8.0.134-1.el10_3 | Fixed 2026-11-11 | RHSA-2026:99147 |
| Red Hat Enterprise Linux 8 | dotnet8.0-0:8.0.134-1.el8_10 | Fixed 2026-11-11 | RHSA-2026:99052 |
| Red Hat Enterprise Linux 9 | dotnet8.0-0:8.0.134-1.el9_9 | Fixed 2026-11-12 | RHSA-2026:99146 |
| Red Hat Hardened Images | dotnet8.0 | Not affected |
Contains Red Hat Security Data © Red Hat, Inc., licensed under CC BY 4.0. Source: https://access.redhat.com/security/data. Modified: reformatted. Red Hat's page for CVE-2026-109478.