{
  "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-2026-62899 .NET Security Feature Bypass Vulnerability - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-62899.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": ".NET Security Feature Bypass Vulnerability",
    "tracking": {
      "current_release_date": "2026-08-11T07:00:00.000Z",
      "generator": {
        "date": "2026-09-25T19:35:13.927Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-62899",
      "initial_release_date": "2026-08-11T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-08-11T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<10.0.11",
                "product": {
                  "name": ".NET 10.0 installed on Mac OS <10.0.11",
                  "product_id": "3"
                }
              },
              {
                "category": "product_version",
                "name": "10.0.11",
                "product": {
                  "name": ".NET 10.0 installed on Mac OS 10.0.11",
                  "product_id": "20838"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 10.0 installed on Mac OS"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<10.0.11",
                "product": {
                  "name": ".NET 10.0 installed on Linux <10.0.11",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "10.0.11",
                "product": {
                  "name": ".NET 10.0 installed on Linux 10.0.11",
                  "product_id": "20839"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 10.0 installed on Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<8.0.30",
                "product": {
                  "name": ".NET 8.0 installed on Windows <8.0.30",
                  "product_id": "10"
                }
              },
              {
                "category": "product_version",
                "name": "8.0.30",
                "product": {
                  "name": ".NET 8.0 installed on Windows 8.0.30",
                  "product_id": "12414"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 8.0 installed on Windows"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<8.0.30",
                "product": {
                  "name": ".NET 8.0 installed on Linux <8.0.30",
                  "product_id": "9"
                }
              },
              {
                "category": "product_version",
                "name": "8.0.30",
                "product": {
                  "name": ".NET 8.0 installed on Linux 8.0.30",
                  "product_id": "12415"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 8.0 installed on Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<8.0.30",
                "product": {
                  "name": ".NET 8.0 installed on Mac OS <8.0.30",
                  "product_id": "8"
                }
              },
              {
                "category": "product_version",
                "name": "8.0.30",
                "product": {
                  "name": ".NET 8.0 installed on Mac OS 8.0.30",
                  "product_id": "12416"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 8.0 installed on Mac OS"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<9.0.19",
                "product": {
                  "name": ".NET 9.0 installed on Linux <9.0.19",
                  "product_id": "7"
                }
              },
              {
                "category": "product_version",
                "name": "9.0.19",
                "product": {
                  "name": ".NET 9.0 installed on Linux 9.0.19",
                  "product_id": "12432"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 9.0 installed on Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<9.0.19",
                "product": {
                  "name": ".NET 9.0 installed on Mac OS <9.0.19",
                  "product_id": "6"
                }
              },
              {
                "category": "product_version",
                "name": "9.0.19",
                "product": {
                  "name": ".NET 9.0 installed on Mac OS 9.0.19",
                  "product_id": "12433"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 9.0 installed on Mac OS"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<9.0.19",
                "product": {
                  "name": ".NET 9.0 installed on Windows <9.0.19",
                  "product_id": "5"
                }
              },
              {
                "category": "product_version",
                "name": "9.0.19",
                "product": {
                  "name": ".NET 9.0 installed on Windows 9.0.19",
                  "product_id": "12434"
                }
              }
            ],
            "category": "product_name",
            "name": ".NET 9.0 installed on Windows"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<17.14.38",
                "product": {
                  "name": "Microsoft Visual Studio 2022 version 17.14 <17.14.38",
                  "product_id": "4"
                }
              },
              {
                "category": "product_version",
                "name": "17.14.38",
                "product": {
                  "name": "Microsoft Visual Studio 2022 version 17.14 17.14.38",
                  "product_id": "16767"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Visual Studio 2022 version 17.14"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<18.8.3",
                "product": {
                  "name": "Microsoft Visual Studio 2026 version 18.8 <18.8.3",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "18.8.3",
                "product": {
                  "name": "Microsoft Visual Studio 2026 version 18.8 18.8.3",
                  "product_id": "21681"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Visual Studio 2026 version 18.8"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-62899",
      "cwe": {
        "id": "CWE-444",
        "name": "Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "fixed": [
          "20838",
          "20839",
          "12414",
          "12415",
          "12416",
          "12432",
          "12433",
          "12434",
          "16767",
          "21681"
        ],
        "known_affected": [
          "3",
          "2",
          "10",
          "9",
          "8",
          "7",
          "6",
          "5",
          "4",
          "1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-62899 .NET Security Feature Bypass Vulnerability - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-62899.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "10.0.11:Security Update:https://support.microsoft.com/help/5122106",
          "product_ids": [
            "3",
            "2"
          ],
          "url": "https://support.microsoft.com/help/5122106"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "8.0.30:Security Update:https://support.microsoft.com/help/5122104",
          "product_ids": [
            "10",
            "9",
            "8"
          ],
          "url": "https://support.microsoft.com/help/5122104"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "9.0.19:Security Update:https://support.microsoft.com/help/5122105",
          "product_ids": [
            "7",
            "6",
            "5"
          ],
          "url": "https://support.microsoft.com/help/5122105"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "17.14.38:Security Update",
          "product_ids": [
            "4"
          ]
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "18.8.3:Security Update",
          "product_ids": [
            "1"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 5.2,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9",
            "10"
          ]
        }
      ],
      "title": ".NET Security Feature Bypass Vulnerability"
    }
  ]
}