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CVE-2026-107289

Estado: AnalizadaMedia (6.8)—

Pydantic AI es un framework de agentes en Python para crear aplicaciones y flujos de trabajo con IA generativa. Desde la 1.56.0 hasta la 1.107.6 y la 2.44.0, las aplicaciones que habilitan el acceso a la red local para URL influidas por el atacante mediante FileUrl con force_download='allow-local' o web_fetch_tool con allow_local_urls=True pueden eludir la lista de bloqueo de metadatos en la nube añadiendo un identificador de zona IPv6 a una dirección de metadatos IPv6.

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La igualdad y el hash de IPv6Address incluyen el identificador de zona, por lo que la comparación con la lista de bloqueo falla aunque la pila de red ignore la zona en un destino que no es link-local y llegue al servicio de metadatos, lo que podría exponer credenciales IAM en la nube. Los ajustes opcionales están deshabilitados de forma predeterminada y el problema requiere un entorno con IPv6 habilitado. Este problema está corregido en las versiones 1.107.6 y 2.44.0.

Traducción automática del texto original de NVD (en inglés).

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.

Explotación de aplicación expuesta (Pydantic AI con opciones opt-in de acceso a red local) mediante bypass de validación IPv6 para acceder a metadatos en la nube y robar credenciales IAM.

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 ManagementNetwork SegmentationLimit Access to Resource Over NetworkVulnerability ScanningUser Account ManagementSSL/TLS Inspection

Tecnologías afectadas (1)

Pydantic — Pydantic AI

CWE

Referencias

JSON original (NVD)

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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-10-08T16:07:09.527203Z"
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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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          "value": "CWE-918"
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          "lang": "en",
          "value": "CWE-1289"
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      "lang": "en",
      "value": "Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.56.0 until 1.107.6 and 2.44.0, applications that opt attacker-influenced URLs into local network access through FileUrl with force_download='allow-local' or web_fetch_tool with allow_local_urls=True can bypass the cloud-metadata blocklist by appending an IPv6 zone identifier to an IPv6 metadata address. IPv6Address equality and hashing include the zone identifier, so the blocklist comparison fails even though the network stack ignores the zone on a non-link-local destination and reaches the metadata service, potentially exposing cloud IAM credentials. The opt-in settings are disabled by default, and the issue requires an IPv6-enabled environment. This issue is fixed in versions 1.107.6 and 2.44.0."
    }
  ],
  "lastModified": "2026-10-13T14:34:48.123",
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