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CVE-2026-26967

Estado: AnalizadaAlta (8.1)—

PJSIP is a free and open source multimedia communication library written in C. In versions 2.16 and below, there is a critical Heap-based Buffer Overflow vulnerability in PJSIP's H.264 unpacketizer. The bug occurs when processing malformed SRTP packets, where the unpacketizer reads a 2-byte NAL unit size field without validating that both bytes are within the payload buffer bounds. The vulnerability affects applications that receive video using H.264. A patch is available at https://github.com/pjsip/pjproject/commit/f821c214e52b11bae11e4cd3c7f0864538fb5491.

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.

Buffer overflow en librería multimedia expuesta en red (AV:N, PR:N, UI:N); procesamiento de paquetes H.264 malformados permite ejecución de código remoto sin autenticación.

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

Privileged Account ManagementVulnerability ScanningRestrict Web-Based ContentNetwork SegmentationLimit Software InstallationLimit Access to Resource Over Network

Tecnologías afectadas (1)

Pjsip — Pjsip

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-26967",
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  "published": "2026-02-20T01:15:59.953",
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      "url": "https://github.com/pjsip/pjproject/commit/f821c214e52b11bae11e4cd3c7f0864538fb5491",
      "tags": [
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      "value": "PJSIP is a free and open source multimedia communication library written in C. In versions 2.16 and below, there is a critical Heap-based Buffer Overflow vulnerability in PJSIP's H.264 unpacketizer. The bug occurs when processing malformed SRTP packets, where the unpacketizer reads a 2-byte NAL unit size field without validating that both bytes are within the payload buffer bounds. The vulnerability affects applications that receive video using H.264. A patch is available at https://github.com/pjsip/pjproject/commit/f821c214e52b11bae11e4cd3c7f0864538fb5491."
    },
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      "value": "PJSIP es una biblioteca de comunicación multimedia de código abierto y gratuita escrita en C. En las versiones 2.16 e inferiores, existe una vulnerabilidad crítica de desbordamiento de búfer basado en montículo en el despaquetizador H.264 de PJSIP. El error ocurre al procesar paquetes SRTP malformados, donde el despaquetizador lee un campo de tamaño de unidad NAL de 2 bytes sin validar que ambos bytes estén dentro de los límites del búfer de carga útil. La vulnerabilidad afecta a las aplicaciones que reciben video usando H.264. Un parche está disponible en https://github.com/pjsip/pjproject/commit/f821c214e52b11bae11e4cd3c7f0864538fb5491."
    }
  ],
  "lastModified": "2026-06-17T10:26:27.867",
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