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CVE-2020-1747

Estado: ModificadaCrítica (9.8)—

A vulnerability was discovered in the PyYAML library in versions before 5.3.1, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. An attacker could use this flaw to execute arbitrary code on the system by abusing the python/object/new constructor.

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).

Tecnologías afectadas (4)

Fedoraproject — FedoraOpensuse — LeapOracle — Communications Cloud Native Core Network Function Cloud Native EnvironmentPyyaml — Pyyaml

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2020-1747",
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  "published": "2020-03-24T15:15:12.293",
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      "value": "A vulnerability was discovered in the PyYAML library in versions before 5.3.1, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. An attacker could use this flaw to execute arbitrary code on the system by abusing the python/object/new constructor."
    },
    {
      "lang": "es",
      "value": "Se descubrió  una vulnerabilidad en la biblioteca PyYAML versiones anteriores a 5.3.1, donde es susceptible a una ejecución de código arbitraria cuando procesa archivos YAML no seguros  por medio del método full_load o con el cargador FullLoader. Las aplicaciones que usan la biblioteca para procesar entradas no seguras pueden ser vulnerables a este fallo. Un atacante podría usar este fallo para ejecutar código arbitrario en el sistema al violar el constructor python/object/new."
    }
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  "lastModified": "2026-06-17T03:02:19.383",
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