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Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / 26.10 : .NET vulnerabilities (USN-8958-1)

critical Nessus Plugin ID 374084

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / 26.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8958-1 advisory.

 It was discovered that the .NET Blazor WebAssembly debug proxy did not properly escape certain values. An attacker could possibly use this issue to execute arbitrary code. The fix for this CVE was originally released via USN-8942-1, but it was found to be incomplete. This issue only affected dotnet10 and dotnet11. (CVE-2026-102870)

 It was discovered that the Brotli decompression library used by .NET incorrectly handled certain compressed streams. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-111497)

 Alen Cheung discovered that .NET did not properly handle file ownership in certain circumstances. An attacker could possibly use this issue to elevate local privileges. (CVE-2026-114148)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8958-1

Plugin Details

Severity: Critical

ID: 374084

File Name: ubuntu_USN-8958-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/30/2026

Updated: 10/30/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.4

Percentile: 99.83

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

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

CVSS Score Source: CVE-2026-111497

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 9.2

Threat Vector: CVSS:4.0/E:A

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.10, p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-10.0, p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-11.0, p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-8.0, p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-dbg-10.0, p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-dbg-11.0, p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-dbg-8.0, p-cpe:/a:canonical:ubuntu_linux:aspnetcore-targeting-pack-10.0, p-cpe:/a:canonical:ubuntu_linux:aspnetcore-targeting-pack-11.0, p-cpe:/a:canonical:ubuntu_linux:aspnetcore-targeting-pack-8.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-apphost-pack-10.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-apphost-pack-11.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-apphost-pack-8.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-host-10.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-host-11.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-host-8.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-hostfxr-10.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-hostfxr-11.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-hostfxr-8.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-10.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-11.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-8.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-dbg-10.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-dbg-11.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-dbg-8.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-10.0-source-built-artifacts, p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-10.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-11.0-source-built-artifacts, p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-11.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-8.0-source-built-artifacts, p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-8.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-aot-10.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-aot-11.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-dbg-10.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-dbg-11.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-dbg-8.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-targeting-pack-10.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-targeting-pack-11.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-targeting-pack-8.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-templates-10.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-templates-11.0, p-cpe:/a:canonical:ubuntu_linux:dotnet-templates-8.0, p-cpe:/a:canonical:ubuntu_linux:dotnet10, p-cpe:/a:canonical:ubuntu_linux:dotnet11, p-cpe:/a:canonical:ubuntu_linux:dotnet8, p-cpe:/a:canonical:ubuntu_linux:netstandard-targeting-pack-2.1-8.0

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/29/2026

Vulnerability Publication Date: 10/13/2026

CISA Known Exploited Vulnerability Due Dates: 11/10/2026

Reference Information

CVE: CVE-2026-102870, CVE-2026-111497, CVE-2026-114148

USN: 8958-1