Description
Improper control of generation of code ('code injection') in ASP.NET Core allows an unauthorized attacker to execute code over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | .NET 10.0 installed on Linux | 10.0.0 – < 10.0.403 | 10.0.403 |
| Microsoft | .NET 10.0 installed on Mac OS | 10.0.0 – < 10.0.403 | 10.0.403 |
| Microsoft | .NET 10.0 installed on Windows | 10.0.0 – < 10.0.403 | 10.0.403 |
| Microsoft | .NET 11.0 installed on Linux | 11.0.0-preview.1 – < 11.0.100-rc.3 | 11.0.100-rc.3 |
| Microsoft | .NET 11.0 installed on Mac OS | 11.0.0-preview.1 – < 11.0.100-rc.3 | 11.0.100-rc.3 |
| Microsoft | .NET 11.0 installed on Windows | 11.0.0-preview.1 – < 11.0.100-rc.3 | 11.0.100-rc.3 |
| Microsoft | Microsoft Visual Studio 2019 version 16.11 | 16.11.0 – < 16.11.61 | 16.11.61 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 – < 17.14.43 | 17.14.43 |
| Microsoft | Microsoft Visual Studio 2026 version 18.10 | 18.10.0 – < 18.10.4 | 18.10.4 |
| Microsoft | Microsoft Visual Studio 2026 version 18.11 | 18.11.0 – < 18.11.2 | 18.11.2 |
| Microsoft | Microsoft Visual Studio 2026 version 18.12 | 18.12.0 – < 18.12 Insiders 3 | 18.12 Insiders 3 |
| Microsoft | Microsoft.AspNetCore.Components.WebAssembly.DevServer | 11.0.0-preview.1 – < 10.0.14 | 10.0.14 |
| Microsoft | Microsoft.AspNetCore.Components.WebAssembly.Server | 10.0.0 – < 10.0.13 | 10.0.13 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | dotnet10 | 10.0.114-10.0.14-0ubuntu1~26.10.1 | USN-8958-1, USN-8942-1 |
| Ubuntu 26.10 | dotnet11 | 11.0.100-11.0.0~rc3-0ubuntu1~26.10.1 | USN-8958-1, USN-8942-1 |
| Ubuntu 26.04 LTS | dotnet10 | 10.0.114-10.0.14-0ubuntu1~26.04.1 | USN-8958-1, USN-8942-1 |
| Ubuntu 24.04 LTS | dotnet10 | 10.0.114-10.0.14-0ubuntu1~24.04.1 | USN-8958-1, USN-8942-1 |
| Ubuntu 24.04 LTS | dotnet8 | 8.0.132-8.0.32-0ubuntu1~24.04.1 | USN-8958-1, USN-8942-1 |
| Ubuntu 22.04 LTS | dotnet7 | No fix yet | — |
| Ubuntu 22.04 LTS | dotnet8 | 8.0.132-8.0.32-0ubuntu1~22.04.1 | USN-8958-1, USN-8942-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | dotnet-host +8 | 10.0.13-1.el10_2 | RHSA-2026:86195 |
| RHEL 10 | dotnet10.0 +5 | 10.0.113-1.el10_2 | RHSA-2026:86195 |
| RHEL 9 | dotnet-host +8 | 10.0.13-1.el9_8 | RHSA-2026:86193 |
| RHEL 9 | dotnet10.0 +5 | 10.0.113-1.el9_8 | RHSA-2026:86193 |
| RHEL 8 | dotnet +6 | 10.0.113-1.el8_10 | RHSA-2026:86192 |
| RHEL 8 | dotnet-hostfxr-10.0 +7 | 10.0.13-1.el8_10 | RHSA-2026:86192 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | dotnet-host +8 | 10.0.13-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux 10 | dotnet-sdk-10.0 +4 | 10.0.113-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux 9 | dotnet-host +8 | 10.0.13-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux 9 | dotnet-sdk-10.0 +4 | 10.0.113-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux 8 | dotnet +5 | 10.0.113-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux 8 | dotnet-hostfxr-10.0 +7 | 10.0.13-1.el8_10 | ALSA-2026:86192 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | dotnet10.0 | 10.0.113-1.el10_2 | RLSA-2026:86195 |
| Rocky Linux 9 | dotnet10.0 | 10.0.113-1.el9_8 | RLSA-2026:86193 |
| Rocky Linux 8 | dotnet10.0 | 10.0.113-1.el8_10 | RLSA-2026:86192 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dotnet10-runtime | 10.0.13-r0 | — |
| Alpine v3.23 | dotnet10-runtime | 10.0.13-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | dotnet +5 | 8.0.133-1.amzn2023.0.1 | ALAS2023-2026-3367, ALAS2023-2026-3366 |
| Amazon Linux 2023 | dotnet-host +8 | 8.0.33-1.amzn2023.0.1 | ALAS2023-2026-3367, ALAS2023-2026-3366 |
| Amazon Linux 2023 | dotnet-hostfxr-10.0 +7 | 10.0.14-1.amzn2023.0.1 | ALAS2023-2026-3366 |
| Amazon Linux 2023 | dotnet-sdk-10.0 +4 | 10.0.114-1.amzn2023.0.1 | ALAS2023-2026-3366 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | dotnet-host +8 | 10.0.13-1.0.1.el10_2 | ELSA-2026-86195 |
| Oracle Linux 10 | dotnet-sdk-10.0 +4 | 10.0.113-1.0.1.el10_2 | ELSA-2026-86195 |
| Oracle Linux 9 | dotnet-host +8 | 10.0.13-1.0.1.el9_8 | ELSA-2026-86193 |
| Oracle Linux 9 | dotnet-sdk-10.0 +4 | 10.0.113-1.0.1.el9_8 | ELSA-2026-86193 |
| Oracle Linux 8 | dotnet +5 | 10.0.114-1.0.2.el8_10 | ELSA-2026-86192 |
| Oracle Linux 8 | dotnet-host +8 | 10.0.14-1.0.2.el8_10 | ELSA-2026-86192 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| NuGet | Microsoft.AspNetCore.Components.WebAssembly.Server | >= 10.0.0, < 10.0.14 | 10.0.14 | GHSA-g27p-qf6j-c96c |
| NuGet | Microsoft.AspNetCore.Components.WebAssembly.Server | >= 11.0.0-preview.1, < 11.0.0-rc.3.26522.148 | 11.0.0-rc.3.26522.148 | GHSA-g27p-qf6j-c96c |
Advisories 19
- RHSA-2026:86192 Red Hat Security Advisory: .NET 10.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:86193 Red Hat Security Advisory: .NET 10.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:86195 Red Hat Security Advisory: .NET 10.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- ALSA-2026:86192 Critical: .NET 10.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:86195 Critical: .NET 10.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Nov 5, 2026
- ALSA-2026:86193 Critical: .NET 10.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Nov 5, 2026
- WID-SEC-2026-3893 Microsoft Entwicklerwerkzeuge: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 4, 2026
- ELSA-2026-86192 Critical: .NET 10.0 security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 3, 2026
- ALAS2023-2026-3366 Important: dotnet10.0 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 2, 2026
- ALAS2023-2026-3367 Important: dotnet8.0 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 2, 2026
- USN-8958-1 dotnet8, dotnet10, dotnet11 vulnerabilities Ubuntu Security Notices (USN) · Oct 31, 2026
- USN-8942-1 dotnet8, dotnet10, dotnet11 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- MSRC-CVE-2026-102870 ASP.NET Core Remote Code Execution Vulnerability Microsoft Security Response Center · Oct 25, 2026
- RLSA-2026:86193 Critical: .NET 10.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Oct 22, 2026
- RLSA-2026:86192 Critical: .NET 10.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Oct 22, 2026
- RLSA-2026:86195 Critical: .NET 10.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Oct 22, 2026
- ELSA-2026-86195 Critical: .NET 10.0 security, bug fix, and enhancement update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Oct 21, 2026
- ELSA-2026-86193 Critical: .NET 10.0 security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 21, 2026
- NCSC-2026-0426 Kwetsbaarheden verholpen in Microsoft Developer Tools NCSC-NL (Netherlands) · Oct 13, 2026
References
- ASP.NET Core Remote Code Execution Vulnerability vendor-advisory patch