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Vulnerability · Published Aug 11, 2026 · Assigned by microsoft

CVE-2026-70354.NET Core Remote Code Execution Vulnerability

High 7.8

In plain English

A high-severity out-of-bounds write in Microsoft .NET Framework 3.5 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.4%top 69.7% 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 locally.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23dotnet10-runtime10.0.13-r0ALPINE-CVE-2026-70354
Alpine:v3.24dotnet10-runtime10.0.12-r0ALPINE-CVE-2026-70354
Alpine:v3.22dotnet8-runtime8.0.31-r0ALPINE-CVE-2026-70354
Alpine:v3.23dotnet8-runtime8.0.31-r0ALPINE-CVE-2026-70354
Alpine:v3.24dotnet8-runtime8.0.31-r0ALPINE-CVE-2026-70354
Alpine:v3.22dotnet9-runtime9.0.20-r0ALPINE-CVE-2026-70354
Alpine:v3.23dotnet9-runtime9.0.20-r0ALPINE-CVE-2026-70354
Alpine:v3.24dotnet9-runtime9.0.20-r0ALPINE-CVE-2026-70354
NuGetmicrosoft.windowsdesktop.app.runtime.win-arm648.0.30GHSA-gg8c-3338-xw2f
NuGetmicrosoft.windowsdesktop.app.runtime.win-arm649.0.19GHSA-gg8c-3338-xw2f
NuGetmicrosoft.windowsdesktop.app.runtime.win-arm6410.0.11GHSA-gg8c-3338-xw2f
NuGetmicrosoft.windowsdesktop.app.runtime.win-x6410.0.11GHSA-gg8c-3338-xw2f
NuGetmicrosoft.windowsdesktop.app.runtime.win-x648.0.30GHSA-gg8c-3338-xw2f
NuGetmicrosoft.windowsdesktop.app.runtime.win-x649.0.19GHSA-gg8c-3338-xw2f
NuGetmicrosoft.windowsdesktop.app.runtime.win-x868.0.30GHSA-gg8c-3338-xw2f
NuGetmicrosoft.windowsdesktop.app.runtime.win-x8610.0.11GHSA-gg8c-3338-xw2f
NuGetmicrosoft.windowsdesktop.app.runtime.win-x869.0.19GHSA-gg8c-3338-xw2f
Ubuntu:22.04:LTSdotnet7no fix listedUBUNTU-CVE-2026-70354

Affected products (as reported)

VendorProductVersions
Microsoft .NET 10.0 runtime 10.0.0 – before 10.0.11
Microsoft .NET 8.0 runtime 8.0.0 – before 8.0.30
Microsoft .NET 9.0 runtime 9.0.0 – before 9.0.19
Microsoft Microsoft .NET Framework 3.5 3.5.0 – before 2.0.50727.8984 & 3.0.30729.8980
Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 3.0.0.0 – before 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0
Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 4.7.0 – before 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0
Microsoft Microsoft .NET Framework 3.5 AND 4.8 4.8.0 – before 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0
Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 4.8.1 – before 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0
Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.0 – before 4.7.4144.0
Microsoft Microsoft .NET Framework 4.8 4.8.0 – before 4.8.4805.0
Microsoft Microsoft .NET Framework 4.8.1 4.8.0.0 – before 4.8.9344.0
Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.0 – before 17.14.38
Microsoft Microsoft Visual Studio 2026 version 18.8 18.0 – before 18.8.3

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

References