CVE-2026-49853 (GCVE-0-2026-49853)

Vulnerability from cvelistv5 – Published: 2026-07-14 20:41 – Updated: 2026-07-14 20:41
VLAI
Title
Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient
Summary
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, SimpleAsyncHTTPClient shallow-copied redirected requests and removed only the Host header, leaving Authorization, auth_username, auth_password, and auth_mode in place when a redirect changed scheme, host, or port. This issue is fixed in version 6.5.6.
Severity
7.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
Impacted products
Vendor Product Version
tornadoweb tornado Affected: < 6.5.6
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          "vendor": "tornadoweb",
          "versions": [
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            }
          ]
        }
      ],
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        }
      ],
      "metrics": [
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            "integrityImpact": "NONE",
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            "userInteraction": "NONE",
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            "version": "3.1"
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      ],
      "problemTypes": [
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              "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
              "lang": "en",
              "type": "CWE"
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-14T20:41:32.075Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/tornadoweb/tornado/security/advisories/GHSA-3x9g-8vmp-wqvf",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/tornadoweb/tornado/security/advisories/GHSA-3x9g-8vmp-wqvf"
        },
        {
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          "tags": [
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        },
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        },
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          "name": "https://github.com/tornadoweb/tornado/releases/tag/v6.5.6",
          "tags": [
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          ],
          "url": "https://github.com/tornadoweb/tornado/releases/tag/v6.5.6"
        }
      ],
      "source": {
        "advisory": "GHSA-3x9g-8vmp-wqvf",
        "discovery": "UNKNOWN"
      },
      "title": "Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-49853",
    "datePublished": "2026-07-14T20:41:32.075Z",
    "dateReserved": "2026-06-01T22:03:19.640Z",
    "dateUpdated": "2026-07-14T20:41:32.075Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-07-15",
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      "percentile": "0.38618"
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  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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