{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-41066 lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-41066.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files",
    "tracking": {
      "current_release_date": "2026-05-06T14:42:16.000Z",
      "generator": {
        "date": "2026-05-11T08:49:53.834Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-41066",
      "initial_release_date": "2026-04-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-04-26T01:04:41.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-04-27T14:43:16.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        },
        {
          "date": "2026-04-29T01:06:42.000Z",
          "legacy_version": "3",
          "number": "3",
          "summary": "Information published."
        },
        {
          "date": "2026-05-06T01:41:49.000Z",
          "legacy_version": "4",
          "number": "4",
          "summary": "Information published."
        },
        {
          "date": "2026-05-06T14:42:16.000Z",
          "legacy_version": "5",
          "number": "5",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "5"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              },
              {
                "category": "product_version",
                "name": "2.0",
                "product": {
                  "name": "CBL Mariner 2.0",
                  "product_id": "17086"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<azl3 python-lxml 0:4.9.3-1.azl3",
                "product": {
                  "name": "<azl3 python-lxml 0:4.9.3-1.azl3",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "azl3 python-lxml 0:4.9.3-1.azl3",
                "product": {
                  "name": "azl3 python-lxml 0:4.9.3-1.azl3",
                  "product_id": "21239"
                }
              },
              {
                "category": "product_version_range",
                "name": "cbl2 python-lxml 0:4.9.1-1.cbl2",
                "product": {
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                "product": {
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                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "azl3 python-lxml 0:4.9.3-2.azl3",
                "product": {
                  "name": "azl3 python-lxml 0:4.9.3-2.azl3",
                  "product_id": "21313"
                }
              }
            ],
            "category": "product_name",
            "name": "python-lxml"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "<azl3 python-lxml 0:4.9.3-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-2"
        },
        "product_reference": "2",
        "relates_to_product_reference": "17084"
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      {
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      {
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        "relates_to_product_reference": "17086"
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      {
        "category": "default_component_of",
        "full_product_name": {
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        "relates_to_product_reference": "17084"
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          "product_id": "21313-17084"
        },
        "product_reference": "21313",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-41066",
      "cwe": {
        "id": "CWE-611",
        "name": "Improper Restriction of XML External Entity Reference"
      },
      "notes": [
        {
          "category": "general",
          "text": "GitHub_M",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "fixed": [
          "21239-17084",
          "21313-17084"
        ],
        "known_affected": [
          "17084-2",
          "17086-3",
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-41066 lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-41066.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-04-26T01:04:41.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17086-3"
          ]
        },
        {
          "category": "vendor_fix",
          "date": "2026-04-26T01:04:41.000Z",
          "details": "0:4.9.3-2.azl3:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
            "17084-2",
            "17084-1"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 7.5,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "17084-2",
            "17086-3",
            "17084-1"
          ]
        }
      ],
      "title": "lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files"
    }
  ]
}