CVE-2026-42496

Estado: ModificadaCrítica (9.1)—

Archive::Tar versions before 3.08 for Perl extract symlinks with attacker controlled targets outside the extraction directory.

_make_special_file() passes the tar header's linkname to symlink() without validating it against absolute paths or .. segments. The secure-extract mode check that guards regular file extraction does not cover the symlink target.

A subsequent open through the extracted name reads or writes the attacker chosen path.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Puntuación base: 9.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.43%
Percentil entre todas las CVEs puntuadas: 35
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access85 %
Impacto principalT1005 Data from Local Systemcollection90 %
Impacto secundarioT1565 Data Manipulationimpact75 %

Vulnerabilidad de path traversal (CWE-59, CWE-22) en servicio de red sin autenticación (AV:N/PR:N). Permite lectura/escritura de archivos arbitrarios mediante symlinks malformados durante extracción de tar.

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

Network Segmentation Vulnerability Scanning Restrict File and Directory Permissions Privileged Account Management Remote Data Storage Limit Access to Resource Over Network

Tecnologías afectadas (1)

Archive\ — \

CWE

CWE-59
CWE-22

Referencias

JSON original (NVD)

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  "published": "2026-05-26T02:16:40.130",
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      "description": [
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          "value": "CWE-59"
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    {
      "lang": "en",
      "value": "Archive::Tar versions before 3.08 for Perl extract symlinks with attacker controlled targets outside the extraction directory.\n\n_make_special_file() passes the tar header's linkname to symlink() without validating it against absolute paths or .. segments. The secure-extract mode check that guards regular file extraction does not cover the symlink target.\n\nA subsequent open through the extracted name reads or writes the attacker chosen path."
    },
    {
      "lang": "es",
      "value": "Las versiones de Archive::Tar anteriores a la 3.08 para Perl extraen enlaces simbólicos con objetivos controlados por el atacante fuera del directorio de extracción.\n\n_make_special_file() pasa el linkname de la cabecera tar a symlink() sin validarlo contra rutas absolutas o segmentos .. La comprobación del modo de extracción segura que protege la extracción de archivos regulares no cubre el objetivo del enlace simbólico.\n\nUna apertura posterior a través del nombre extraído lee o escribe la ruta elegida por el atacante."
    }
  ],
  "lastModified": "2026-07-24T10:10:00.197",
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    {
      "nodes": [
        {
          "negate": false,
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