The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8553-1 advisory.

    Artur Stetsko discovered that the .NET did not properly validate authentication data. An attacker could     possibly use this issue to elevate privileges. (CVE-2026-47300)

    Levi Broderick discovered that .NET did not properly handle XML encryption during parsing. An attacker     could possibly use this issue to consume excessive resources, resulting in a denial of service.
    (CVE-2026-47302)

    Pham Quang Minh discovered that .NET did not properly parse authentication data. An attacker could     possibly use this issue to bypass authentication and elevate privileges. (CVE-2026-47303)

    Levi Broderick discovered that .NET did not properly verify cryptographic signatures during XML     encryption. An attacker could possibly use this issue to bypass security features over a network and     access encrypted data. (CVE-2026-47304)

    It was discovered that .NET did not properly validate input during TLS handshakes. An attacker could     possibly use this issue to cause .NET to crash, resulting in a denial of service. (CVE-2026-50524)

    Levi Broderick discovered that .NET did not properly handle resource allocation during XML encryption. An     attacker could possibly use this issue to consume excessive resources, resulting in a denial of service.
    (CVE-2026-50525)

    Siwei Li discovered that .NET did not properly handle link resolution before file access during the     container image build process. A local attacker could possibly use this issue to inject resources that     could be incorporated into container images built by other users on the same machine. (CVE-2026-50526)

    Levi Broderick discovered that .NET did not properly handle memory while performing XML encryption. An     attacker could possibly use this issue to cause .NET to crash, resulting in a denial of service.
    (CVE-2026-50527)

    Henrique Pereira discovered that .NET did not properly handle authorization checks during TLS/SSL     connections. An attacker could possibly use this issue to bypass authorization checks during secure     communications. (CVE-2026-50528)

    It was discovered that .NET did not properly handle resource allocation during XML encryption. An attacker     could possibly use this issue to consume excessive resources, resulting in a denial of service.
    (CVE-2026-50648)

    Miha Zupan discovered that .NET did not properly limit resource allocation when handling HTTP/2 requests.
    An attacker could possibly use this issue to consume excessive resources, resulting in a denial of     service. (CVE-2026-50651)

    It was discovered that the .NET SMTP client did not properly handle the encoding or escaping of output. An     attacker could possibly use this issue to spoof messages during message routing. (CVE-2026-50659)

    It was discovered that .NET did not properly validate resource types when parsing X.509 certificates. An     attacker could possibly use this issue to cause .NET to crash, resulting in a denial of service.
    (CVE-2026-57108)

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.

Detections

Analytics

Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : .NET vulnerabilities (USN-8553-1)

critical Nessus Plugin ID 327336

Version 1.4

Version 1.3

Version 1.2

Version 1.1

Version 1.4 Jul 27, 2026, 10:22 AM CVSS metrics ("CVSSv2 score" set to 10.0) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C") CVSS metrics ("CVSSv3 score" set to 9.8) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H") CVSSv2 score source (changed from "CVE-2026-47303" to "CVE-2026-47304") CVSSv3 score source (changed from "CVE-2026-50526" to none) CVSSv3 severity (based on None, severity increased from "Medium" to "High") Plugin Feed: 202607271022
Version 1.3 Jul 23, 2026, 8:43 AM CVSS metrics ("CVSSv3 score" set to 5.5) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N") CVSSv3 score source (set to "CVE-2026-50526") CVSSv3 severity (based on CVE-2026-50526, severity decreased from "High" to "Medium") Plugin Feed: 202607230843
Version 1.2 Jul 18, 2026, 3:00 PM Plugin metadata (Add IAVM Info) Plugin Feed: 202607181500
Version 1.1 Jul 16, 2026, 9:04 PM New Plugin Feed: 202607162104