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CVE-2026-33897

Estado: AnalizadaCrítica (9.9)—

Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the pongo2 chroot feature would isolate all such access to the instance's filesystem.

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This was allowed such that a template could theoretically read a file and then generate a new version of said file. Unfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system's filesystem with root privileges. Version 6.23.0 patches 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.

AV:N con PR:L (red, requiere privilegios) → T1210. Templates pongo2 leen/escriben archivos del host como root, saltando aislamiento: lectura (T1005) y manipulación de datos (T1565) con elevación de privilegios (T1068).

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

Threat Intelligence ProgramNetwork SegmentationApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareVulnerability Scanning

Tecnologías afectadas (1)

Linuxcontainers — Incus

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-33897",
  "cveTags": [],
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          "version": "2.0.3",
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      "value": "Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the pongo2 chroot feature would isolate all such access to the instance's filesystem. This was allowed such that a template could theoretically read a file and then generate a new version of said file. Unfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system's filesystem with root privileges. Version 6.23.0 patches the issue."
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      "value": "Incus es un gestor de contenedores de sistema y máquinas virtuales. Antes de la versión 6.23.0, los archivos de plantilla de instancia pueden usarse para causar lecturas o escrituras arbitrarias como root en el servidor anfitrión. Incus permite plantillas pongo2 dentro de las instancias que pueden usarse en varios momentos del ciclo de vida de la instancia para crear plantillas de archivos dentro de la instancia. Esta implementación particular de pongo2 dentro de Incus permitía la lectura/escritura de archivos, pero con la expectativa de que la característica chroot de pongo2 aislaría todo ese acceso al sistema de archivos de la instancia. Esto se permitía de tal manera que una plantilla podría teóricamente leer un archivo y luego generar una nueva versión de dicho archivo. Desafortunadamente, el mecanismo de aislamiento chroot es completamente omitido por pongo2, lo que lleva a un fácil acceso a todo el sistema de archivos del sistema con privilegios de root. La versión 6.23.0 parchea el problema."
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  "lastModified": "2026-06-17T10:38:16.753",
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