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DEBIAN-CVE-2026-91992

Type: advisorySource: OSV1 source record

Tornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are reused across requests without proper state clearing. Attackers can obtain sensitive credentials by issuing requests through the same client instance, allowing TLS certificates or proxy authentication to persist across unintended requests.

Announced 15 Sept 2026Source revision 1

Original source ↗

DEBIAN-CVE-2026-91992

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-91992

python-tornado

Source reference: /affected/0/package/name

Affected versions: 6.2.0-3
Source reference: /affected/0/versions
6.2.0-3+deb12u1
Source reference: /affected/0/versions
6.2.0-3+deb12u2
Source reference: /affected/0/versions
6.2.0-3+deb12u3
Source reference: /affected/0/versions
6.2.0-3+deb12u4
Source reference: /affected/0/versions
6.3.2-1
Source reference: /affected/0/versions
6.4.0-1
Source reference: /affected/0/versions
6.4.0-2
Source reference: /affected/0/versions
6.4.1-1
Source reference: /affected/0/versions
6.4.1-2
Source reference: /affected/0/versions
6.4.1-3
Source reference: /affected/0/versions
6.4.2-1
Source reference: /affected/0/versions
6.4.2-2
Source reference: /affected/0/versions
6.4.2-3
Source reference: /affected/0/versions
6.5.2-1
Source reference: /affected/0/versions
6.5.2-2
Source reference: /affected/0/versions
6.5.2-3
Source reference: /affected/0/versions
6.5.4-0.1
Source reference: /affected/0/versions
6.5.4-1
Source reference: /affected/0/versions
6.5.5-1
Source reference: /affected/0/versions
6.5.5-2
Source reference: /affected/0/versions
6.5.5-3
Source reference: /affected/0/versions
6.5.5-4
Source reference: /affected/0/versions
6.5.5-5
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

python-tornado

Source reference: /affected/1/package/name

Affected versions: 6.4.2-3
Source reference: /affected/1/versions
6.4.2-3+deb13u1
Source reference: /affected/1/versions
6.4.2-3+deb13u2
Source reference: /affected/1/versions
6.5.2-1
Source reference: /affected/1/versions
6.5.2-2
Source reference: /affected/1/versions
6.5.2-3
Source reference: /affected/1/versions
6.5.4-0.1
Source reference: /affected/1/versions
6.5.4-1
Source reference: /affected/1/versions
6.5.5-1
Source reference: /affected/1/versions
6.5.5-2
Source reference: /affected/1/versions
6.5.5-3
Source reference: /affected/1/versions
6.5.5-4
Source reference: /affected/1/versions
6.5.5-5
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

python-tornado

Source reference: /affected/2/package/name

Affected versions: 6.4.2-3
Source reference: /affected/2/versions
6.5.2-1
Source reference: /affected/2/versions
6.5.2-2
Source reference: /affected/2/versions
6.5.2-3
Source reference: /affected/2/versions
6.5.4-0.1
Source reference: /affected/2/versions
6.5.4-1
Source reference: /affected/2/versions
6.5.5-1
Source reference: /affected/2/versions
6.5.5-2
Source reference: /affected/2/versions
6.5.5-3
Source reference: /affected/2/versions
6.5.5-4
Source reference: /affected/2/versions
6.5.5-5
Source reference: /affected/2/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "python-tornado",
      "purl": "pkg:deb/debian/python-tornado?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "6.2.0-3",
      "6.2.0-3+deb12u1",
      "6.2.0-3+deb12u2",
      "6.2.0-3+deb12u3",
      "6.2.0-3+deb12u4",
      "6.3.2-1",
      "6.4.0-1",
      "6.4.0-2",
      "6.4.1-1",
      "6.4.1-2",
      "6.4.1-3",
      "6.4.2-1",
      "6.4.2-2",
      "6.4.2-3",
      "6.5.2-1",
      "6.5.2-2",
      "6.5.2-3",
      "6.5.4-0.1",
      "6.5.4-1",
      "6.5.5-1",
      "6.5.5-2",
      "6.5.5-3",
      "6.5.5-4",
      "6.5.5-5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91992.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "python-tornado",
      "purl": "pkg:deb/debian/python-tornado?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "6.4.2-3",
      "6.4.2-3+deb13u1",
      "6.4.2-3+deb13u2",
      "6.5.2-1",
      "6.5.2-2",
      "6.5.2-3",
      "6.5.4-0.1",
      "6.5.4-1",
      "6.5.5-1",
      "6.5.5-2",
      "6.5.5-3",
      "6.5.5-4",
      "6.5.5-5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91992.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "python-tornado",
      "purl": "pkg:deb/debian/python-tornado?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "6.4.2-3",
      "6.5.2-1",
      "6.5.2-2",
      "6.5.2-3",
      "6.5.4-0.1",
      "6.5.4-1",
      "6.5.5-1",
      "6.5.5-2",
      "6.5.5-3",
      "6.5.5-4",
      "6.5.5-5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91992.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #58573 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 18:12:03 GMT
Publisher date: Tue, 15 Sep 2026 16:17:58 GMT

Read the original announcement