USN-8025-2 (UBUNTU-CVE-2026-21218)

Vulnerability from osv_ubuntu – Published: 2026-02-16 07:49 – Updated: 2026-04-27 14:11 – Source website
VLAI
Summary
dotnet8, dotnet10 vulnerability
Details

USN 8025-1 fixed a vulnerability in .NET. This update provides the corresponding fix for Ubuntu 24.04 LTS.

Original advisory details:

Kevin Jones discovered that the System.Security.Cryptography.Cose component in .NET did not properly handle certain missing special elements in input data. An attacker could possibly use this issue to bypass security checks and gain unauthorized access or perform data manipulation.

References
To clipboard 

{
  "affected": [
    {
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        "cves_map": {
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              "id": "CVE-2026-21218",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
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        "name": "dotnet10",
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      },
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    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-21218",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
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            "binary_name": "aspnetcore-runtime-8.0",
            "binary_version": "8.0.24-0ubuntu1~24.04.1"
          },
          {
            "binary_name": "aspnetcore-runtime-dbg-8.0",
            "binary_version": "8.0.24-0ubuntu1~24.04.1"
          },
          {
            "binary_name": "aspnetcore-targeting-pack-8.0",
            "binary_version": "8.0.24-0ubuntu1~24.04.1"
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            "binary_version": "8.0.24-0ubuntu1~24.04.1"
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            "binary_version": "8.0.24-0ubuntu1~24.04.1"
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            "binary_name": "dotnet-sdk-8.0",
            "binary_version": "8.0.124-0ubuntu1~24.04.1"
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            "binary_version": "8.0.124-0ubuntu1~24.04.1"
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            "binary_version": "8.0.124-0ubuntu1~24.04.1"
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        "name": "dotnet8",
        "purl": "pkg:deb/ubuntu/dotnet8@8.0.124-8.0.24-0ubuntu1~24.04.1?arch=source\u0026distro=noble"
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        "8.0.120-8.0.20-0ubuntu1~24.04.1",
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  ],
  "aliases": [],
  "details": "USN 8025-1 fixed a vulnerability in .NET. This update provides the\ncorresponding fix for Ubuntu 24.04 LTS.\n\nOriginal advisory details:\n\n Kevin Jones discovered that the System.Security.Cryptography.Cose\n component  in .NET did not properly handle certain missing special\n elements in input  data. An attacker could possibly use this issue to\n bypass security checks  and gain unauthorized access or perform data\n manipulation.",
  "id": "USN-8025-2",
  "modified": "2026-04-27T14:11:47Z",
  "published": "2026-02-16T07:49:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8025-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-21218"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "dotnet8, dotnet10 vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-21218"
  ]
}



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