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CVE-2026-85396

Estado: Pendiente de análisisAlta (8.7)—

rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.

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.

Path traversal en librería expuesta en red (AV:N, PR:N, UI:N) permite escribir archivos fuera del directorio previsto (T1565.001) y leer datos (T1005) mediante entradas malformadas en ZIP.

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

Vulnerability ScanningRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data StorageNetwork SegmentationLimit Access to Resource Over Network

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Rubyzip — RubyzipAI

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-85396",
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          "options": [
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  "published": "2026-09-03T19:17:31.527",
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      "url": "https://github.com/rubyzip/rubyzip",
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    {
      "lang": "en",
      "value": "rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix."
    }
  ],
  "lastModified": "2026-09-24T20:28:01.780",
  "sourceIdentifier": "disclosure@vulncheck.com"
}