CVE-2026-62871: CVE-2026-62871: Local Code Execution and Elevation of Privilege in .NET and Visual Studio

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CVE-2026-62871: Local Code Execution and Elevation of Privilege in .NET and Visual Studio

Vulnerability ID: CVE-2026-62871
CVSS Score: 7.8
Published: 2026-08-11

CVE-2026-62871 is a high-severity local code execution and elevation of privilege vulnerability in Microsoft .NET and Microsoft Visual Studio. It arises from an out-of-bounds write (heap-based buffer overflow) in the runtime environment during native interoperability or unmanaged pointer manipulation, requiring user interaction to execute arbitrary instructions.

TL;DR

An out-of-bounds write in Microsoft .NET and Visual Studio allows local attackers to execute arbitrary code via malformed payloads, requiring user interaction.

Technical Details

CWE ID: CWE-787 / CWE-122
Attack Vector: Local
CVSS v3.1: 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
Impact: Elevation of Privilege / Arbitrary Code Execution
Exploit Status: None (Theoretical)
KEV Status: Not Listed

Affected Systems

Microsoft .NET 8.0
Microsoft .NET 9.0
Microsoft .NET 10.0
Microsoft Visual Studio 2022
Microsoft Visual Studio 2026

Mitigation Strategies

Deploy official Microsoft cumulative updates for .NET and Visual Studio.
Enforce execution policies to prevent unprivileged users from executing untrusted binaries.
Implement strong application whitelisting and software restriction policies.

Remediation Steps:

Identify vulnerable runtimes on system hosts by executing 'dotnet --list-runtimes' via the command line.
Update .NET 8.0 to version 8.0.30 or higher, .NET 9.0 to 9.0.19 or higher, and .NET 10.0 to 10.0.11 or higher.
Update Visual Studio 2022 (v17.14) to version 17.14.38 or later, and Visual Studio 2026 (v18.8) to version 18.8.3 or later.