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CVE-2026-87766

Estado: Pendiente de análisisAlta (8.8)—

A flaw was found in bubblewrap. During sandbox setup, creating files or directories under the new root can follow a parent symlink onto the host via /oldroot, writing attacker-chosen paths outside the sandbox as the launching user. This happens before the sandboxed process starts. This issue is GHSA-pxhw-h44j-8pfx. It is fixed in bubblewrap 0.12.0.

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.

CWE-59 (symlink attack) con AV:L/PR:L permite escalada de privilegios local. El atacante escribe en rutas del host fuera de sandbox antes de iniciar el proceso. T1565.001 por manipulación de archivos.

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 ProgramRestrict File and Directory PermissionsRemote Data StorageExecution PreventionEncrypt Sensitive InformationApplication Isolation and Sandboxing

Tecnologías afectadas (1)

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

Bubblewrap — BubblewrapAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-87766",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2026-87766",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-09T14:03:32.467147Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "secalert@redhat.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 2
      }
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  "affected": [
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      "affectedData": [
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  "references": [
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      "url": "https://access.redhat.com/security/cve/CVE-2026-87766",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugs.debian.org/1145655",
      "source": "secalert@redhat.com"
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    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2530542",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://github.com/containers/bubblewrap/releases/tag/v0.12.0",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx",
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      "url": "https://www.openwall.com/lists/oss-security/2026/08/27/7",
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  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
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      "source": "secalert@redhat.com",
      "description": [
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          "value": "CWE-59"
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  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in bubblewrap. During sandbox setup, creating files or directories under the new root can follow a parent symlink onto the host via /oldroot, writing attacker-chosen paths outside the sandbox as the launching user. This happens before the sandboxed process starts. This issue is GHSA-pxhw-h44j-8pfx. It is fixed in bubblewrap 0.12.0."
    }
  ],
  "lastModified": "2026-09-22T23:17:07.763",
  "sourceIdentifier": "secalert@redhat.com"
}