Detections
Analytics

Microsoft .NET Framework (September 2026)

high Nessus Plugin ID 344819

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Synopsis

The Microsoft .NET Framework installation on the remote host is affected by multiple vulnerabilities.

Description

The Microsoft .NET Framework installation on the remote host is missing a security update. It is, therefore, affected by the following vulnerabilities:

 - Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
 (CVE-2026-62886)

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

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

Solution

Microsoft has released the following security updates to address this issue:
 -KB5126043
 -KB5126044
 -KB5126045
 -KB5126046
 -KB5126047
 -KB5126048
 -KB5126049
 -KB5126050
 -KB5126051
 -KB5126052
 -KB5126053
 -KB5126421
 -KB5126422
 -KB5126424

Plugin Details

Severity: High

ID: 344819

File Name: smb_nt_ms26_sep_dotnet.nasl

Version: 1.1

Type: Local

Agent: windows

Published: 9/11/2026

Updated: 9/11/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.17

CVSS v2

Risk Factor: Critical

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-69522

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_framework

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 9/8/2026

Reference Information

CVE: CVE-2026-62886, CVE-2026-69522

CWE: 122, 190

IAVA: 2026-A-0965

MSFT: MS26-5126043, MS26-5126044, MS26-5126045, MS26-5126046, MS26-5126047, MS26-5126048, MS26-5126049, MS26-5126050, MS26-5126051, MS26-5126052, MS26-5126053, MS26-5126421, MS26-5126422, MS26-5126424

MSKB: 5126043, 5126044, 5126045, 5126046, 5126047, 5126048, 5126049, 5126050, 5126051, 5126052, 5126053, 5126421, 5126422, 5126424