Security Update for Microsoft ASP.NET Core (June 2026)

high Nessus Plugin ID 320852

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Synopsis

The remote Windows host is affected by a ASP.NET Core vulnerability

Description

The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by the following vulnerability as referenced in the vendor advisory.

- Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network. (CVE-2026-45591)

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: 320852

File Name: smb_nt_ms26_jun_aspdotnet_core.nasl

Version: 1.3

Type: Local

Agent: windows

Family: Windows

Published: 6/12/2026

Updated: 6/19/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-45591

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:asp.net_core

Required KB Items: SMB/Registry/Enumerated, installed_sw/ASP .NET Core Windows

Exploit Ease: No known exploits are available

Patch Publication Date: 6/9/2026

Vulnerability Publication Date: 6/9/2026

Reference Information

CVE: CVE-2026-45591

IAVA: 2026-A-0565, 2026-A-0566

Detections

Analytics