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CVE-2026-40280

Estado: AnalizadaAlta (7.8)—

Gotenberg is an API-based document conversion tool. In versions 8.30.1 and earlier, the default private-IP deny-lists for the --webhook-deny-list and --api-download-from-deny-list flags use a case-sensitive regular expression (^https?://) to match URL schemes. Because Go's net/url.Parse() normalizes the scheme to lowercase before establishing the outbound TCP connection, an attacker can bypass the deny-list by simply capitalizing part of the URL scheme (e.g., HTTP://, HTTPS://, or Http://). This allows unauthenticated requests to reach internal network services, including private IP ranges, loopback addresses, and cloud instance metadata endpoints such as HTTP://169.254.169.254/latest/meta-data/.

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This bypasses the same security control that was patched in CVE-2026-27018.

This issue has been fixed in version 8.31.0.

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.

API expuesta sin autenticación permite bypasear restricciones de IP mediante normalización de esquema URL (HTTP:// capitalizado), accediendo a servicios internos y metadatos en cloud (SSRF/proxy) y extrayendo credenciales.

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)

Thecodingmachine — Gotenberg

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-40280",
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-05-06T18:41:39.882866Z"
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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  "published": "2026-05-05T20:16:38.633",
  "references": [
    {
      "url": "https://github.com/advisories/GHSA-jjwv-57xh-xr6r",
      "tags": [
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  "vulnStatus": "Analyzed",
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      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
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    }
  ],
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      "lang": "en",
      "value": "Gotenberg is an API-based document conversion tool. In versions 8.30.1 and earlier, the default private-IP deny-lists for the --webhook-deny-list and --api-download-from-deny-list flags use a case-sensitive regular expression (^https?://) to match URL schemes. Because Go's net/url.Parse() normalizes the scheme to lowercase before establishing the outbound TCP connection, an attacker can bypass the deny-list by simply capitalizing part of the URL scheme (e.g., HTTP://, HTTPS://, or Http://). This allows unauthenticated requests to reach internal network services, including private IP ranges, loopback addresses, and cloud instance metadata endpoints such as HTTP://169.254.169.254/latest/meta-data/. \n\nThis bypasses the same security control that was patched in CVE-2026-27018.\n\nThis issue has been fixed in version 8.31.0."
    },
    {
      "lang": "es",
      "value": "Gotenberg es una herramienta de conversión de documentos basada en API. En las versiones 8.30.1 y anteriores, las listas de denegación de IP privadas predeterminadas para las banderas --webhook-deny-list y --api-download-from-deny-list utilizan una expresión regular sensible a mayúsculas y minúsculas (^https?://) para coincidir con los esquemas de URL. Debido a que net/url.Parse() de Go normaliza el esquema a minúsculas antes de establecer la conexión TCP saliente, un atacante puede eludir la lista de denegación simplemente capitalizando parte del esquema de URL (p. ej., HTTP://, HTTPS:// o Http://). Esto permite que las solicitudes no autenticadas alcancen servicios de red internos, incluyendo rangos de IP privadas, direcciones de bucle invertido y puntos finales de metadatos de instancias en la nube como HTTP://169.254.169.254/latest/meta-data/.\n\nEsto elude el mismo control de seguridad que fue parcheado en CVE-2026-27018.\n\nEste problema ha sido solucionado en la versión 8.31.0."
    }
  ],
  "lastModified": "2026-07-24T21:10:00.143",
  "configurations": [
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      "nodes": [
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          "negate": false,
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