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CVE-2026-25210

Estado: ModificadaAlta (7.8)—

In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.

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.

Acceso local sin interacción (AV:L, UI:N) con privilegios limitados (PR:L) permite escalada de privilegios mediante integer overflow en buffer; impacto de ejecución de código (I:H, C:H en sandbox local).

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

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Libexpat Project — Libexpat

CWE

Referencias

JSON original (NVD)

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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
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              "technicalImpact": "total"
            }
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          "version": "2.0.3",
          "timestamp": "2026-04-29T00:00:00+00:00"
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      "value": "In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation."
    },
    {
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      "value": "En libexpat antes de 2.7.4, la función doContent no determina correctamente el tamaño del búfer bufSize porque no hay una comprobación de desbordamiento de entero para la reasignación del búfer de etiquetas."
    }
  ],
  "lastModified": "2026-06-17T10:24:19.123",
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