{
  "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-2026-42772 Potential CPU DoS via O(n^2) Fragment Reassembly in QUIC - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-42772.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": "Potential CPU DoS via O(n^2) Fragment Reassembly in QUIC",
    "tracking": {
      "current_release_date": "2026-10-16T01:47:40.000Z",
      "generator": {
        "date": "2026-10-17T07:01:09.363Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-42772",
      "initial_release_date": "2026-10-03T01:22:17.000Z",
      "revision_history": [
        {
          "date": "2026-10-03T01:22:17.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-10-10T15:17:09.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        },
        {
          "date": "2026-10-13T02:24:46.000Z",
          "legacy_version": "3",
          "number": "3",
          "summary": "Information published."
        },
        {
          "date": "2026-10-16T01:47:40.000Z",
          "legacy_version": "4",
          "number": "4",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "4"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<azl3 openssl 0:3.3.7-6.azl3",
                "product": {
                  "name": "<azl3 openssl 0:3.3.7-6.azl3",
                  "product_id": "4"
                }
              },
              {
                "category": "product_version",
                "name": "azl3 openssl 0:3.3.7-6.azl3",
                "product": {
                  "name": "azl3 openssl 0:3.3.7-6.azl3",
                  "product_id": "21819"
                }
              }
            ],
            "category": "product_name",
            "name": "openssl"
          },
          {
            "category": "product_name",
            "name": "azl3 cloud-hypervisor 0:52.0.152-1.azl3",
            "product": {
              "name": "azl3 cloud-hypervisor 0:52.0.152-1.azl3",
              "product_id": "6"
            }
          },
          {
            "category": "product_name",
            "name": "azl3 kata-containers 0:4.1.0.kata0-1.azl3",
            "product": {
              "name": "azl3 kata-containers 0:4.1.0.kata0-1.azl3",
              "product_id": "2"
            }
          },
          {
            "category": "product_name",
            "name": "azl3 openvmm 0:0.1.0-1.azl3",
            "product": {
              "name": "azl3 openvmm 0:0.1.0-1.azl3",
              "product_id": "5"
            }
          },
          {
            "category": "product_name",
            "name": "azl3 rust 0:1.75.0-31.azl3",
            "product": {
              "name": "azl3 rust 0:1.75.0-31.azl3",
              "product_id": "3"
            }
          },
          {
            "category": "product_name",
            "name": "azl3 rust 0:1.96.1-2.azl3",
            "product": {
              "name": "azl3 rust 0:1.96.1-2.azl3",
              "product_id": "1"
            }
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 cloud-hypervisor 0:52.0.152-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-6"
        },
        "product_reference": "6",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kata-containers 0:4.1.0.kata0-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-2"
        },
        "product_reference": "2",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "<azl3 openssl 0:3.3.7-6.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-4"
        },
        "product_reference": "4",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 openssl 0:3.3.7-6.azl3 as a component of Azure Linux 3.0",
          "product_id": "21819-17084"
        },
        "product_reference": "21819",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 openvmm 0:0.1.0-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-5"
        },
        "product_reference": "5",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 rust 0:1.75.0-31.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-3"
        },
        "product_reference": "3",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 rust 0:1.96.1-2.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-42772",
      "cwe": {
        "id": "CWE-407",
        "name": "Inefficient Algorithmic Complexity"
      },
      "notes": [
        {
          "category": "general",
          "text": "openssl",
          "title": "Assigning CNA"
        }
      ],
      "flags": [
        {
          "label": "component_not_present",
          "product_ids": [
            "17084-6",
            "17084-2",
            "17084-1"
          ]
        },
        {
          "label": "vulnerable_code_not_in_execute_path",
          "product_ids": [
            "17084-5",
            "17084-3"
          ]
        }
      ],
      "product_status": {
        "fixed": [
          "21819-17084"
        ],
        "known_affected": [
          "17084-4"
        ],
        "known_not_affected": [
          "17084-6",
          "17084-2",
          "17084-5",
          "17084-3",
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-42772 Potential CPU DoS via O(n^2) Fragment Reassembly in QUIC - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-42772.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-03T01:22:17.000Z",
          "details": "0:3.3.7-7.azl3:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
            "17084-4"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 5.3,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "17084-4"
          ]
        }
      ],
      "title": "Potential CPU DoS via O(n^2) Fragment Reassembly in QUIC"
    }
  ]
}