{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "last_affected": "6.6.0"
                  }
                ],
                "source": "DESCRIPTION"
              },
              {
                "range": [
                  {
                    "fixed": "c503241622c0efe7c40110d89834ce8b7fead1e4"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c503241622c0efe7c40110d89834ce8b7fead1e4"
            }
          ],
          "repo": "https://github.com/tornadoweb/tornado",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-5cjw-f85j-cv6r"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-601"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126347.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "range": [
              {
                "fixed": "6.6.1"
              }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
          }
        ]
      },
      {
        "extracted_events": [
          {
            "range": [
              {
                "fixed": "6.6.1"
              }
            ],
            "source": "DESCRIPTION"
          }
        ]
      }
    ]
  },
  "details": "Tornado is a Python web framework and asynchronous networking library. In versions through 6.6.0, applications using  tornado.web.RedirectHandler  with URL templates that allow attacker-controlled substitutions to influence the destination can be vulnerable to an open redirect using three or more leading slashes. Differences between Python’s URL parsing and browser URL interpretation allow a crafted destination to redirect a user to an attacker-controlled host. The remediation for CVE-2026-116578 in version 6.6.0 did not fully address this case. This issue is fixed in version 6.6.1.",
  "id": "CVE-2026-126347",
  "modified": "2026-11-14T02:30:57.863496589Z",
  "published": "2026-11-12T21:52:22.374Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126347.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/tornadoweb/tornado/security/advisories/GHSA-5cjw-f85j-cv6r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126347"
    },
    {
      "type": "FIX",
      "url": "https://github.com/tornadoweb/tornado/commit/c503241622c0efe7c40110d89834ce8b7fead1e4"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Tornado: Open redirect via triple-slash redirect paths"
}