CVE-2026-89091
Estado: Pendiente de análisisAlta (8.8)—
Se ha encontrado un fallo en ansible-core. Al instalar una colección con `ansible-galaxy collection install`, el extractor de archivos valida las rutas de los miembros mediante normalización léxica de rutas (os.path.abspath) en lugar de resolver los enlaces simbólicos (os.path.realpath), y no realiza ninguna comprobación de contención en los miembros de directorio de tipo enlace simbólico antes de crearlos.
Leer descripción completaMostrar menos
Un tarball de colección manipulado puede encadenar entradas de directorio de enlaces simbólicos de modo que un miembro de archivo posterior se escriba fuera del directorio de destino previsto. Esto permite a un atacante que consiga que una víctima instale una colección maliciosa sobrescribir archivos arbitrarios con los privilegios del usuario que ejecuta ansible-galaxy, lo que conduce a la ejecución de código en el nodo de control. Se trata de una omisión de la corrección de CVE-2020-10691.
Traducción automática del texto original de NVD (en inglés).
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Puntuación base: 8.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.48%
- Percentil entre todas las CVEs puntuadas: 40
- Fecha de la puntuación: 14/10/2026
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.
- Explotación
T1203Exploitation for Client Executionexecution90 % - Impacto principal
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto secundario
T1059Command and Scripting Interpreterexecution80 %
Vector CVSS con UI:R (interacción del usuario) requiere que la víctima instale una colección maliciosa. El archivo crafted permite sobrescribir archivos arbitrarios con privilegios del usuario (escalada), desencadenando ejecución de código en el nodo de control.
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
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-59
Referencias
JSON original (NVD)
Mostrar
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"timestamp": "2026-10-09T15:00:00.715697Z"
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],
"published": "2026-10-08T22:17:35.777",
"references": [
{
"url": "https://access.redhat.com/security/cve/CVE-2026-89091",
"source": "secalert@redhat.com"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531646",
"source": "secalert@redhat.com"
}
],
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"type": "Secondary",
"source": "secalert@redhat.com",
"description": [
{
"lang": "en",
"value": "CWE-59"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in ansible-core. When installing a collection with\n`ansible-galaxy collection install`, the archive extractor validates member\npaths using lexical path normalisation (os.path.abspath) instead of resolving\nsymbolic links (os.path.realpath), and it performs no containment check on\nsymlink-typed directory members before creating them. A crafted collection\ntarball can chain symlink directory entries so that a subsequent file member is\nwritten outside the intended destination directory. This allows an attacker who\ncan get a victim to install a malicious collection to overwrite arbitrary files\nwith the privileges of the user running ansible-galaxy, leading to code\nexecution on the control node. This is a bypass of the fix for CVE-2020-10691."
}
],
"lastModified": "2026-10-09T16:37:45.710",
"sourceIdentifier": "secalert@redhat.com"
}