Case-Insensitive Path Matching in corydolphin/flask-cors

{
  "id": "9d7006f0f8544ee815ecbdc201af1a28c372f07069fdb0168d226dc848ca8792",
  "url": "https://osv.dev/vulnerability/CVE-2024-6866",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Case-Insensitive Path Matching in corydolphin/flask-cors",
    "summary": "corydolphin/flask-cors version 4.01 contains a vulnerability where the request path matching is case-insensitive due to the use of the `try_match` function, which is originally intended for matching hosts. This results in a mismatch because paths in URLs are case-sensitive, but the regex matching treats them as case-insensitive. This misconfiguration can lead to significant security vulnerabilities, allowing unauthorized origins to access paths meant to be restricted, resulting in data exposure and potential data leaks.",
    "evidence": "osv:CVE-2024-6866",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2024-6866",
      "aliases": [
        "CVE-2024-6866",
        "GHSA-43qf-4rqw-9q2g",
        "PYSEC-2026-1383"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/corydolphin/flask-cors",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1df178ccc019c5aa7282246288c04f867d716790"
                },
                {
                  "last_affected": "1df178ccc019c5aa7282246288c04f867d716790"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:flask-cors_project:flask-cors:4.0.1:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.1"
                      },
                      {
                        "last_affected": "4.0.1"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-6866.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.674662344Z",
      "provider": "osv",
      "references": [
        "https://huntr.com/bounties/808c11af-faee-43a8-824b-b5ab4f62b9e6",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/6xxx/CVE-2024-6866.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-6866"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-178"
        ],
        "cna_assigner": "@huntr_ai",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/6xxx/CVE-2024-6866.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-6866",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492507,
  "published_at": "2025-03-20T10:10:59.521+00:00"
}