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CVE-2026-35527

Estado: AnalizadaMedia (5.3)—

Incus is an open source container and virtual machine manager. In versions prior to 7.0.0, the image import flow issues an outbound HEAD request to a user-supplied URL before validating the request against project restrictions such as restricted.images.servers. The imgPostURLInfo function constructs and sends a HEAD request directly from the attacker-supplied source URL to resolve image metadata, and this network interaction occurs before the flow reaches the point where the import would be rejected by policy. Although the actual image download is blocked by the project restriction, an authenticated user can coerce the daemon into making blind HEAD requests to arbitrary destinations.

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These requests include server metadata in custom headers (Incus-Server-Architectures, Incus-Server-Version), which discloses information about the host environment to the attacker-controlled endpoint. This blind SSRF primitive can be used to probe internal services, unroutable address space, or cloud metadata endpoints reachable from the host.

This vulnerability pattern is similar to CVE-2026-24767. This issue has been fixed in version 7.0.0.

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).

Tecnologías afectadas (1)

Linuxcontainers — Incus

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-35527",
  "cveTags": [],
  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
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          "version": "2.0.3",
          "timestamp": "2026-05-06T14:50:32.461722Z"
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  "published": "2026-05-05T21:16:22.097",
  "references": [
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      "url": "https://github.com/lxc/incus/blob/v6.22.0/cmd/incusd/images.go",
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      "lang": "en",
      "value": "Incus is an open source container and virtual machine manager. In versions prior to 7.0.0, the image import flow issues an outbound HEAD request to a user-supplied URL before validating the request against project restrictions such as restricted.images.servers. The imgPostURLInfo function constructs and sends a HEAD request directly from the attacker-supplied source URL to resolve image metadata, and this network interaction occurs before the flow reaches the point where the import would be rejected by policy. Although the actual image download is blocked by the project restriction, an authenticated user can coerce the daemon into making blind HEAD requests to arbitrary destinations.\n\nThese requests include server metadata in custom headers (Incus-Server-Architectures, Incus-Server-Version), which discloses information about the host environment to the attacker-controlled endpoint. This blind SSRF primitive can be used to probe internal services, unroutable address space, or cloud metadata endpoints reachable from the host.\n\nThis vulnerability pattern is similar to CVE-2026-24767. This issue has been fixed in version 7.0.0."
    },
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      "lang": "es",
      "value": "Incus es un gestor de contenedores y máquinas virtuales de código abierto. En versiones anteriores a la 7.0.0, el flujo de importación de imágenes emite una solicitud HEAD saliente a una URL proporcionada por el usuario antes de validar la solicitud contra restricciones del proyecto como restricted.images.servers. La función imgPostURLInfo construye y envía una solicitud HEAD directamente desde la URL de origen proporcionada por el atacante para resolver metadatos de la imagen, y esta interacción de red ocurre antes de que el flujo alcance el punto en el que la importación sería rechazada por la política. Aunque la descarga real de la imagen está bloqueada por la restricción del proyecto, un usuario autenticado puede forzar al demonio a realizar solicitudes HEAD ciegas a destinos arbitrarios.\n\nEstas solicitudes incluyen metadatos del servidor en encabezados personalizados (Incus-Server-Architectures, Incus-Server-Version), lo que divulga información sobre el entorno del host al endpoint controlado por el atacante. Esta primitiva SSRF ciega puede utilizarse para sondear servicios internos, espacio de direcciones no enrutable o endpoints de metadatos de la nube accesibles desde el host.\n\nEste patrón de vulnerabilidad es similar a CVE-2026-24767. Este problema ha sido solucionado en la versión 7.0.0."
    }
  ],
  "lastModified": "2026-07-24T21:10:00.143",
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