{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "41ae55e9310ff27fa6f26af4727e5590"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "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"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-71328 .NET and Visual Studio Remote Code Execution Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71328"
      },
      {
        "category": "self",
        "summary": "CVE-2026-71328 .NET and Visual Studio Remote Code Execution Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-71328.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Exploitability Index",
        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
      },
      {
        "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": ".NET and Visual Studio Remote Code Execution Vulnerability",
    "tracking": {
      "current_release_date": "2026-09-25T07:00:00.000Z",
      "generator": {
        "date": "2026-10-30T21:48:42.624Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-71328",
      "initial_release_date": "2026-09-08T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-09-08T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-09-25T07:00:00.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Security Updates table updated provide links to the KB articles and download center updates. Microsoft recommends installing the updates."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<18.9.3",
                "product": {
                  "name": "Microsoft Visual Studio 2026 version 18.9 <18.9.3",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "18.9.3",
                "product": {
                  "name": "Microsoft Visual Studio 2026 version 18.9 18.9.3",
                  "product_id": "21787"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Visual Studio 2026 version 18.9"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<10.0.12",
                "product": {
                  "name": ".NET 10.0 runtime installed on Windows <10.0.12",
                  "product_id": "3"
                }
              },
              {
                "category": "product_version",
                "name": "10.0.12",
                "product": {
                  "name": ".NET 10.0 runtime installed on Windows 10.0.12",
                  "product_id": "20837"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 10.0 runtime installed on Windows"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<8.0.31",
                "product": {
                  "name": ".NET 8.0 runtime installed on Windows <8.0.31",
                  "product_id": "6"
                }
              },
              {
                "category": "product_version",
                "name": "8.0.31",
                "product": {
                  "name": ".NET 8.0 runtime installed on Windows 8.0.31",
                  "product_id": "12414"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 8.0 runtime installed on Windows"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<9.0.20",
                "product": {
                  "name": ".NET 9.0 runtime installed on Windows <9.0.20",
                  "product_id": "5"
                }
              },
              {
                "category": "product_version",
                "name": "9.0.20",
                "product": {
                  "name": ".NET 9.0 runtime installed on Windows 9.0.20",
                  "product_id": "12434"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 9.0 runtime installed on Windows"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<17.14.40",
                "product": {
                  "name": "Microsoft Visual Studio 2022 version 17.14 <17.14.40",
                  "product_id": "4"
                }
              },
              {
                "category": "product_version",
                "name": "17.14.40",
                "product": {
                  "name": "Microsoft Visual Studio 2022 version 17.14 17.14.40",
                  "product_id": "16767"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Visual Studio 2022 version 17.14"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<11.0 RC1",
                "product": {
                  "name": ".NET 11.0 runtime installed on Windows <11.0 RC1",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "11.0 RC1",
                "product": {
                  "name": ".NET 11.0 runtime installed on Windows 11.0 RC1",
                  "product_id": "21783"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 11.0 runtime installed on Windows"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-71328",
      "cwe": {
        "id": "CWE-122",
        "name": "Heap-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "This attack requires a user to open a specially crafted file from the attacker to initiate remote code execution.",
          "title": "According to the CVSS metric, the attack vector is network (AV:N) and user interaction is required (UI:R). What is the target context of the remote code execution?"
        }
      ],
      "product_status": {
        "fixed": [
          "12414",
          "12434",
          "16767",
          "20837",
          "21783",
          "21787"
        ],
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-71328 .NET and Visual Studio Remote Code Execution Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71328"
        },
        {
          "category": "self",
          "summary": "CVE-2026-71328 .NET and Visual Studio Remote Code Execution Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-71328.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-08T07:00:00.000Z",
          "details": "18.9.3:Security Update:https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes",
          "product_ids": [
            "1"
          ],
          "url": "https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes"
        },
        {
          "category": "vendor_fix",
          "date": "2026-09-08T07:00:00.000Z",
          "details": "10.0.12:Security Update:https://support.microsoft.com/kb/5126106",
          "product_ids": [
            "3"
          ],
          "url": "https://support.microsoft.com/kb/5126106"
        },
        {
          "category": "vendor_fix",
          "date": "2026-09-08T07:00:00.000Z",
          "details": "8.0.31:Security Update:https://support.microsoft.com/kb/5126104",
          "product_ids": [
            "6"
          ],
          "url": "https://support.microsoft.com/kb/5126104"
        },
        {
          "category": "vendor_fix",
          "date": "2026-09-08T07:00:00.000Z",
          "details": "9.0.20:Security Update:https://support.microsoft.com/help/5126105",
          "product_ids": [
            "5"
          ],
          "url": "https://support.microsoft.com/help/5126105"
        },
        {
          "category": "vendor_fix",
          "date": "2026-09-08T07:00:00.000Z",
          "details": "17.14.40:Security Update:https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes",
          "product_ids": [
            "4"
          ],
          "url": "https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes"
        },
        {
          "category": "vendor_fix",
          "date": "2026-09-08T07:00:00.000Z",
          "details": "11.0 RC1:Security Update",
          "product_ids": [
            "2"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 7.7,
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Remote Code Execution"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Unlikely"
        }
      ],
      "title": ".NET and Visual Studio Remote Code Execution Vulnerability"
    }
  ]
}