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Vulnerability · Published Oct 13, 2026 · Assigned by microsoft

CVE-2026-70197.NET and Visual Studio Remote Code Execution Vulnerability

High 8.1

In plain English

A high-severity out-of-bounds write in Microsoft Visual Studio 2019 version 16.11 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.8%top 43.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23dotnet10-runtime10.0.13-r0ALPINE-CVE-2026-70197
Alpine:v3.24dotnet10-runtime10.0.13-r0ALPINE-CVE-2026-70197
Alpine:v3.22dotnet8-runtime8.0.32-r0ALPINE-CVE-2026-70197
Alpine:v3.23dotnet8-runtime8.0.32-r0ALPINE-CVE-2026-70197
Alpine:v3.24dotnet8-runtime8.0.32-r0ALPINE-CVE-2026-70197
Alpine:v3.22dotnet9-runtime9.0.21-r0ALPINE-CVE-2026-70197
Alpine:v3.23dotnet9-runtime9.0.21-r0ALPINE-CVE-2026-70197
Alpine:v3.24dotnet9-runtime9.0.21-r0ALPINE-CVE-2026-70197
NuGetmicrosoft.netcore.app.runtime.win-arm649.0.22GHSA-4mpw-cpwj-hxxj
NuGetmicrosoft.netcore.app.runtime.win-arm6410.0.14GHSA-4mpw-cpwj-hxxj
NuGetmicrosoft.netcore.app.runtime.win-arm648.0.33GHSA-4mpw-cpwj-hxxj
NuGetmicrosoft.netcore.app.runtime.win-arm6411.0.0-rc.3.26522.148GHSA-4mpw-cpwj-hxxj
NuGetmicrosoft.netcore.app.runtime.win-x649.0.22GHSA-4mpw-cpwj-hxxj
NuGetmicrosoft.netcore.app.runtime.win-x6411.0.0-rc.3.26522.148GHSA-4mpw-cpwj-hxxj
NuGetmicrosoft.netcore.app.runtime.win-x6410.0.14GHSA-4mpw-cpwj-hxxj
NuGetmicrosoft.netcore.app.runtime.win-x648.0.33GHSA-4mpw-cpwj-hxxj
NuGetmicrosoft.netcore.app.runtime.win-x8610.0.14GHSA-4mpw-cpwj-hxxj
NuGetmicrosoft.netcore.app.runtime.win-x868.0.33GHSA-4mpw-cpwj-hxxj
NuGetmicrosoft.netcore.app.runtime.win-x8611.0.0-rc.3.26522.148GHSA-4mpw-cpwj-hxxj
NuGetmicrosoft.netcore.app.runtime.win-x869.0.22GHSA-4mpw-cpwj-hxxj
Ubuntu:22.04:LTSdotnet7no fix listedUBUNTU-CVE-2026-70197

Affected products (as reported)

VendorProductVersions
Microsoft .NET 10.0 installed on Linux 10.0.0 – before 10.0.403
Microsoft .NET 10.0 installed on Mac OS 10.0.0 – before 10.0.403
Microsoft .NET 10.0 installed on Windows 10.0.0 – before 10.0.403
Microsoft .NET 10.0 runtime 10.0.0 – before 10.0.13
Microsoft .NET 11.0 installed on Linux 11.0.0-preview.1 – before 11.0.100-rc.3
Microsoft .NET 11.0 installed on Mac OS 11.0.0-preview.1 – before 11.0.100-rc.3
Microsoft .NET 11.0 installed on Windows 11.0.0-preview.1 – before 11.0.100-rc.3.26522.148
Microsoft .NET 11.0 runtime 11.0.0 – before 11.0.0-rc.2
Microsoft .NET 8.0 installed on Linux 8.0.0 – before 8.0.427
Microsoft .NET 8.0 installed on Mac OS 8.0.0 – before 8.0.427
Microsoft .NET 8.0 installed on Windows 8.0.0 – before 8.0.427
Microsoft .NET 8.0 runtime 8.0.0 – before 8.0.32
Microsoft .NET 9.0 installed on Linux 9.0.0 – before 9.0.320
Microsoft .NET 9.0 installed on Mac OS 9.0.0 – before 9.0.320
Microsoft .NET 9.0 installed on Windows 9.0.0 – before 9.0.320
Microsoft .NET 9.0 runtime 9.0.0 – before 9.0.21
Microsoft Microsoft Visual Studio 2019 version 16.11 16.11.0 – before 16.11.61
Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.0 – before 17.14.43
Microsoft Microsoft Visual Studio 2026 version 18.10 18.10.0 – before 18.10.4
Microsoft Microsoft Visual Studio 2026 version 18.11 18.11.0 – before 18.11.2
Microsoft Microsoft Visual Studio 2026 version 18.12 18.12.0 – before 18.12 Insiders 3

Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

References