CVE-2026-33210

Estado: ModificadaAlta (8.3)—
Ruby JSON is a JSON implementation for Ruby. From version 2.14.0 to before versions 2.15.2.1, 2.17.1.2, and 2.19.2, a format string injection vulnerability can lead to denial of service attacks or information disclosure, when the allow_duplicate_key: false parsing option is used to parse user supplied documents. This issue has been patched in versions 2.15.2.1, 2.17.1.2, and 2.19.2.
CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 8.3
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 1.01%
Percentil entre todas las CVEs puntuadas: 62
Fecha de la puntuación: 5/10/2026
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.
ExplotaciónT1190 Exploit Public-Facing Applicationinitial access75 %
Impacto principalT1499.004 Application or System Exploitationimpact70 %
Impacto secundarioT1005 Data from Local Systemcollection60 %
Vulnerabilidad de inyección de formato en JSON de Ruby accesible remotamente (AV:N) sin autenticación (PR:N). Causa DoS (VA:H) e información disclosure (VC:L) mediante documentos JSON malformados.
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 Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing
Tecnologías afectadas (1)

Ruby-lang — Json
CWE

CWE-134
CWE-134
Referencias

JSON original (NVD)

Mostrar
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  "published": "2026-03-20T23:16:46.010",
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    {
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33210.json",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    }
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-134"
        }
      ]
    },
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      "type": "Secondary",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "description": [
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          "lang": "en",
          "value": "CWE-134"
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    {
      "lang": "en",
      "value": "Ruby JSON is a JSON implementation for Ruby. From version 2.14.0 to before versions 2.15.2.1, 2.17.1.2, and 2.19.2, a format string injection vulnerability can lead to denial of service attacks or information disclosure, when the allow_duplicate_key: false parsing option is used to parse user supplied documents. This issue has been patched in versions 2.15.2.1, 2.17.1.2, and 2.19.2."
    },
    {
      "lang": "es",
      "value": "Ruby JSON es una implementación de JSON para Ruby. Desde la versión 2.14.0 hasta antes de las versiones 2.15.2.1, 2.17.1.2 y 2.19.2, una vulnerabilidad de inyección de cadena de formato puede llevar a ataques de denegación de servicio o revelación de información, cuando la opción de análisis allow_duplicate_key: false se utiliza para analizar documentos proporcionados por el usuario. Este problema ha sido parcheado en las versiones 2.15.2.1, 2.17.1.2 y 2.19.2."
    }
  ],
  "lastModified": "2026-08-21T13:17:24.320",
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