Security advisory

{
  "id": "ab9fe324d4e4326398927780e6ae026186e88b21cfc215b796356c56fe65e25d",
  "url": "https://osv.dev/vulnerability/CVE-2020-25032",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-25032",
    "summary": "An issue was discovered in Flask-CORS (aka CORS Middleware for Flask) before 3.0.9. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.",
    "evidence": "osv:CVE-2020-25032",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-25032",
      "aliases": [
        "CVE-2020-25032",
        "GHSA-xc3p-ff3m-f46v",
        "PYSEC-2020-43"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/corydolphin/flask-cors",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "91babb941e07a1f45636bdcb75675f13ce1503a2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:flask-cors_project:flask-cors:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.0.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "91babb941e07a1f45636bdcb75675f13ce1503a2"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "3.0.9"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.0.8",
            "3.0.7",
            "3.0.6",
            "3.0.5",
            "3.0.4",
            "3.0.3",
            "3.0.2",
            "3.0.1",
            "3.0.0",
            "2.1.3",
            "2.1.2",
            "2.1.1",
            "2.1.0",
            "2.0.1",
            "2.0.0",
            "2.0.0rc1",
            "1.10.3",
            "1.10.2",
            "1.10.1",
            "1.10.0",
            "1.9.0",
            "1.8.1",
            "v1.8.0",
            "v1.7.4",
            "v1.7.3",
            "v1.7.2",
            "v1.7.0",
            "v1.6.1",
            "v1.6.0",
            "v1.4.0",
            "v1.3.1",
            "v1.3.0",
            "v1.2.1",
            "v1.2.0",
            "v1.1.3",
            "v1.1.2",
            "v1.1.1",
            "v1.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-25032.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:52.623118410Z",
      "provider": "osv",
      "references": [
        "https://github.com/corydolphin/flask-cors/releases/tag/3.0.9",
        "https://www.debian.org/security/2020/dsa-4775"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "10.0"
                  },
                  {
                    "last_affected": "10.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*",
              "cpe:2.3:a:opensuse:backports_sle:15.0:sp2:*:*:*:*:*:*"
            ],
            "vendor_product": "opensuse:backports_sle",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "15.0-sp1"
                  },
                  {
                    "last_affected": "15.0-sp1"
                  },
                  {
                    "introduced": "15.0-sp2"
                  },
                  {
                    "last_affected": "15.0-sp2"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*",
              "cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*"
            ],
            "vendor_product": "opensuse:leap",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "15.1"
                  },
                  {
                    "last_affected": "15.1"
                  },
                  {
                    "introduced": "15.2"
                  },
                  {
                    "last_affected": "15.2"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-25032",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383986,
  "published_at": "2020-08-31T04:15:12.06+00:00"
}