Microsoft Security Advisory CVE-2026-32175 – .NET Core Tampering Vulnerability
Date: 2026-05
Affected: nuget/Microsoft.NetCore.App.Runtime.win-x86, nuget/Microsoft.NetCore.App.Runtime.win-x86, nuget/Microsoft.NetCore.App.Runtime.win-x86
Attack vector: path-traversal
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-32175
CWE: CWE-36
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

## Executive Summary: Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0, .NET 9.0, and .NET 10.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A tampering vulnerability exists when .NET Core improperly handles specially crafted files. An attacker who successfully exploited this vulnerability could write arbitrary files and directories to certain locations on a vulnerable system. However, an attacker would have limited control over the destination of the files and directories. To exploit the vulnerability, an attacker must send a specially crafted file to a vulnerable system. The security update fixes the vulnerability by ensuring .NET Core properly handles files. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/396 ## CVSS Details - **Version:** 3.1 - **Severity:** - **Score:** 4.3 - **Vector:** /AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - **Weakness:** CWE-36: Absolute Path Traversal ## Affected Platforms - **Platforms:** Windows - **Architectures:** All ## <a name="affected-packages"></a>Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below ### <a name=".NET 10"></a>.NET 10 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [Microsoft.NetCore.App


Mitigations:

Architectural layers (MAESTRO):