Security Update for Microsoft .NET Core (September 2026)

high Nessus Plugin ID 344808

Synopsis

The Microsoft .NET Core installations on the remote host are affected by multiple vulnerabilities.

Description

The Microsoft .NET Core installations on the remote host are missing a security update. It is, therefore, affected by multiple vulnerabilities as referenced in the vendor advisory.

- Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network. (CVE-2026-69439)

- Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to execute code over a network. (CVE-2026-69522, CVE-2026-71328)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update .NET Core, remove vulnerable packages and refer to vendor advisory.

Plugin Details

Severity: High

ID: 344808

File Name: smb_nt_ms26_sep_dotnet_core.nasl

Version: 1.1

Type: Local

Agent: windows

Family: Windows

Published: 9/11/2026

Updated: 9/11/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.15

CVSS v3

Risk Factor: High

Base Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:/a:microsoft:.net_core

Required KB Items: installed_sw/.NET Core Windows

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 9/8/2026

Reference Information

CVE: CVE-2026-69439, CVE-2026-69522, CVE-2026-71328

CWE: 122

IAVA: 2026-A-0949

Detections

Analytics