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CVE-2026-85184

Estado: AnalizadaCrítica (9.1)—

@fastify/middie versions >= 9.1.0 and before 9.3.4 decide whether to run path-scoped middleware by matching against the raw request target, while the Fastify router resolves an absolute-form request target to its path before dispatching. Because the two layers evaluate different strings, a request using an absolute-form target reaches the route handler while the path-scoped middleware, such as authentication or authorization, is skipped. An unauthenticated network attacker can use this to bypass path-based access controls in a Fastify application that relies on middie for those controls. Users should upgrade to @fastify/middie 9.3.4 or later.

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/PR:N permite explotación remota sin privilegios (T1190). El bypass de autenticación/autorización permite acceso no autorizado (T1078) y potencial manipulación de datos (T1565.001) al eludir controles path-scoped.

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 ManagementApplication Developer GuidanceActive Directory ConfigurationVulnerability ScanningUser TrainingUser Account Management

Tecnologías afectadas (1)

Fastify — Fastify/middie

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-85184",
  "cveTags": [],
  "metrics": {
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          "options": [
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              "exploitation": "none"
            },
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            },
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          "timestamp": "2026-09-04T19:36:12.098740Z"
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  "published": "2026-09-04T10:17:13.900",
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        "Vendor Advisory"
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      "description": [
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      "lang": "en",
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  ],
  "lastModified": "2026-09-15T20:02:28.677",
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