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CVE-2025-25293

Estado: ModificadaAlta (7.7)—

ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. Prior to versions 1.12.4 and 1.18.0, ruby-saml is susceptible to remote Denial of Service (DoS) with compressed SAML responses. ruby-saml uses zlib to decompress SAML responses in case they're compressed. It is possible to bypass the message size check with a compressed assertion since the message size is checked before inflation and not after. This issue may lead to remote Denial of Service (DoS). Versions 1.12.4 and 1.18.0 fix the issue.

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.

Vulnerabilidad de DoS remota en servicio web SAML accesible en red sin autenticación (AV:N/PR:N/UI:N). Bypass de validación de tamaño en descompresión zlib causa agotamiento de recursos (VA:H).

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

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (2)

Omniauth — Omniauth SamlOnelogin — Ruby-saml

CWE

Referencias

JSON original (NVD)

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      "value": "ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. Prior to versions 1.12.4 and 1.18.0, ruby-saml is susceptible to remote Denial of Service (DoS) with compressed SAML responses. ruby-saml uses zlib to decompress SAML responses in case they're compressed. It is possible to bypass the message size check with a compressed assertion since the message size is checked before inflation and not after. This issue may lead to remote Denial of Service (DoS). Versions 1.12.4 and 1.18.0 fix the issue."
    },
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      "value": "ruby-saml proporciona inicio de sesión único (SSO) con lenguaje de marcado para aserciones de seguridad (SAML) para Ruby. En versiones anteriores a la 1.12.4 y la 1.18.0, ruby-saml era susceptible a ataques de denegación de servicio (DoS) remotos con respuestas SAML comprimidas. ruby-saml utiliza zlib para descomprimir las respuestas SAML en caso de que estén comprimidas. Es posible omitir la comprobación del tamaño del mensaje con una aserción comprimida, ya que el tamaño del mensaje se comprueba antes del inflado, no después. Este problema puede provocar ataques de denegación de servicio (DoS) remotos. Las versiones 1.12.4 y 1.18.0 solucionan el problema."
    }
  ],
  "lastModified": "2026-06-17T09:00:37.887",
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