Detections
Analytics
Security Update for Microsoft .NET Core (October 2026)
critical Nessus Plugin ID 366546
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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.- Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.
(CVE-2026-87697)
- Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.
(CVE-2026-96224, CVE-2026-96235)
- Heap-based buffer overflow in Microsoft QUIC allows an unauthorized attacker to execute code over a network. (CVE-2026-105016)
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.See Also
https://dotnet.microsoft.com/download/dotnet/10.0
https://dotnet.microsoft.com/download/dotnet/8.0
https://dotnet.microsoft.com/download/dotnet/9.0
https://github.com/dotnet/announcements/issues/445
https://github.com/dotnet/announcements/issues/446
https://github.com/dotnet/announcements/issues/447
https://github.com/dotnet/announcements/issues/448
https://github.com/dotnet/announcements/issues/449
https://github.com/dotnet/announcements/issues/450
https://github.com/dotnet/announcements/issues/451
https://github.com/dotnet/announcements/issues/454
https://github.com/dotnet/announcements/issues/456
https://github.com/dotnet/announcements/issues/466
https://github.com/dotnet/announcements/issues/467
https://github.com/dotnet/announcements/issues/468
https://github.com/dotnet/announcements/issues/469
https://github.com/dotnet/announcements/issues/470
https://github.com/dotnet/announcements/issues/471
https://github.com/dotnet/announcements/issues/474
https://github.com/dotnet/announcements/issues/475
https://github.com/dotnet/announcements/issues/476
https://github.com/dotnet/announcements/issues/477
https://github.com/dotnet/announcements/issues/479
https://github.com/dotnet/announcements/issues/480
https://github.com/dotnet/announcements/issues/481
https://github.com/dotnet/announcements/issues/482
https://github.com/dotnet/announcements/issues/483
https://github.com/dotnet/announcements/issues/488
https://github.com/dotnet/announcements/issues/489
https://github.com/dotnet/announcements/issues/490
https://support.microsoft.com/help/5130034
https://support.microsoft.com/help/5130035
https://support.microsoft.com/help/5130036
http://www.nessus.org/u?399b6da0
Plugin Details
Severity: Critical
ID: 366546
File Name: smb_nt_ms26_oct_dotnet_core.nasl
Version: 1.1
Type: Local
Agent: windows
Family: Windows
Published: 10/16/2026
Updated: 10/16/2026
Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.7
Percentile: 95.81
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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: 10/13/2026
Vulnerability Publication Date: 10/13/2026
Reference Information
CVE: CVE-2026-102870, CVE-2026-105016, CVE-2026-58280, CVE-2026-66822, CVE-2026-69651, CVE-2026-70007, CVE-2026-70035, CVE-2026-70162, CVE-2026-70174, CVE-2026-70197, CVE-2026-83520, CVE-2026-84008, CVE-2026-85363, CVE-2026-85790, CVE-2026-87697, CVE-2026-96222, CVE-2026-96224, CVE-2026-96225, CVE-2026-96229, CVE-2026-96231, CVE-2026-96232, CVE-2026-96233, CVE-2026-96234, CVE-2026-96235, CVE-2026-96958, CVE-2026-96959, CVE-2026-96960