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CVE-2026-103261

Estado: AplazadaMedia (6.9)—

Tornado before 6.5.9 fails to limit the number of query string fields in HTTPServerRequest.__init__, allowing remote attackers to cause event-loop stalling by sending requests with thousands of query parameters. Attackers can send unauthenticated GET requests with unbounded query-string field counts to degrade response times for all clients sharing the same IOLoop.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

CWE-770 (falta de límite en entrada) en aplicación expuesta (AV:N, PR:N). Atacante remoto sin autenticación envía GET con miles de parámetros causando stalling del event-loop, generando DoS de aplicación.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Tornado — TornadoAI

CWE

Referencias

JSON original (NVD)

Mostrar
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        "ssvcData": {
          "id": "CVE-2026-103261",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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              "automatable": "yes"
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          "version": "2.0.3",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "integrityImpact": "NONE",
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    "cvssMetricV40": [
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          "valueDensity": "NOT_DEFINED",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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  "affected": [
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      "affectedData": [
        {
          "vendor": "tornadoweb",
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          "versions": [
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              "version": "0",
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          "packageURL": "pkg:pypi/tornado",
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  "published": "2026-10-01T11:17:20.847",
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      "url": "https://github.com/tornadoweb/tornado/commit/03945136ea9746eccf61caf88edae39642e59c93",
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    }
  ],
  "lastModified": "2026-10-01T15:17:26.580",
  "sourceIdentifier": "disclosure@vulncheck.com"
}