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CVE-2026-109391

Estado: AplazadaCrítica (9.2)—
Gravedad9.2Crítica · CVSS 4.0
Probabilidad de explotación0.48 %mayor que el 40 % de las CVE
Explotación activaNono figura en el catálogo de CISA
Exploit públicoNo conocidosin código público localizado

Square Squash hasta el commit e73f280 contiene una vulnerabilidad de deserialización insegura que permite a atacantes no autenticados almacenar YAML manipulado a través del endpoint POST /api/1.0/symbolication. Cuando se simbolizan ocurrencias que hacen referencia al UUID de simbolización controlado por el atacante, los valores almacenados se pasan a YAML.load con SafeYAML en modo inseguro, lo que permite la deserialización arbitraria de objetos Ruby y la potencial ejecución de código.

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

CVSS

Puntuación base
9.2
Versión
4.0
Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días
0.48 %
Percentil entre todas las CVEs puntuadas
40
Fecha de la puntuación
21/10/2026

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.

CVE-2026-109391: deserialization insegura en endpoint POST sin autenticación (AV:N/PR:N) permite almacenar objetos YAML maliciosos que se deserializan sin validación (CWE-502), resultando en ejecución arbitraria de código Ruby mediante unsafe YAML.load.

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 SegmentationVulnerability ScanningRestrict Web-Based ContentRestrict File and Directory PermissionsRemote Data Storage

Tecnologías afectadas (1)

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

Square — SquashAI

CWE

Referencias

Mostrar las 7 referencias

JSON original (NVD)

Mostrar
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
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  "references": [
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      "url": "https://github.com/SquareSquash/web",
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    {
      "url": "https://github.com/SquareSquash/web/blob/e73f2805f9eb30780a5c213b001f0f4255660fbf/app/controllers/api/v1_controller.rb",
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    {
      "lang": "en",
      "value": "Square Squash through commit e73f280 contains an insecure deserialization vulnerability that allows unauthenticated attackers to store crafted YAML via the POST /api/1.0/symbolication endpoint. When occurrences referencing the attacker-controlled symbolication UUID are symbolicated, the stored values are passed to YAML.load with SafeYAML in unsafe mode, enabling arbitrary Ruby object deserialization and potential code execution."
    }
  ],
  "lastModified": "2026-10-16T18:25:45.343",
  "sourceIdentifier": "disclosure@vulncheck.com"
}