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CVE-2026-107288

Estado: AnalizadaBaja (3.7)—

Pydantic AI es un framework de agentes en Python para crear aplicaciones y flujos de trabajo con IA generativa. Desde la 1.77.0 hasta la 1.107.6 y la 2.44.0, web_fetch_tool local y la alternativa local de WebFetch comparan las entradas de blocked_domains con el nombre de host de una URL antes de que ambos valores se normalicen a la forma utilizada por getaddrinfo.

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Un modelo influido por el atacante puede utilizar una grafía IDNA equivalente, un separador de etiquetas no ASCII, una variación de mayúsculas y minúsculas o una etiqueta raíz final que se resuelva en un host bloqueado pero no coincida con la cadena configurada, haciendo que la aplicación obtenga ese host con sus propios privilegios. allowed_domains falla en modo cerrado para las grafías no coincidentes, y las protecciones de IP privadas y de metadatos en la nube siguen siendo eficaces. 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.

AV:N sin UI:N sugiere T1190. La vulnerabilidad permite SSRF mediante evasión de filtros de dominio (bypass de blocked_domains con variantes IDNA), accediendo a metadatos o hosts internos con privilegios de la aplicación.

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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{
  "id": "CVE-2026-107288",
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
            },
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              "automatable": "no"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-10-08T17:28:31.014859Z"
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          "baseScore": 3.7,
          "attackVector": "NETWORK",
          "baseSeverity": "LOW",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.2
      }
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  },
  "affected": [
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  "published": "2026-10-08T16:17:04.147",
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        "Vendor Advisory"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
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          "lang": "en",
          "value": "CWE-918"
        },
        {
          "lang": "en",
          "value": "CWE-1289"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.6 and 2.44.0, the local web_fetch_tool and the WebFetch local fallback compare blocked_domains entries with a URL hostname before both values are normalized to the form used by getaddrinfo. An attacker-influenced model can use an equivalent IDNA spelling, non-ASCII label separator, case variation, or trailing root label that resolves to a blocked host but does not match the configured string, causing the application to fetch that host with its own privileges. allowed_domains fails closed for unmatched spellings, and private-IP and cloud-metadata protections remain effective. This issue is fixed in versions 1.107.6 and 2.44.0."
    }
  ],
  "lastModified": "2026-10-13T14:35:05.370",
  "configurations": [
    {
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