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CVE-2023-45139

Estado: ModificadaAlta (7.5)—

fontTools es una librería para manipular fuentes, escrita en Python. El módulo subsetting tiene una vulnerabilidad de inyección de entidades externas XML (XXE) que permite a un atacante resolver entidades arbitrarias cuando se analiza una fuente candidata (fuentes OT-SVG), que contiene una tabla SVG. Esto permite a los atacantes incluir archivos arbitrarios del sistema de archivos en el que se ejecuta fontTools o realizar solicitudes web desde el sistema host. Esta vulnerabilidad ha sido parcheada en la versión 4.43.0.

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)

Fonttools — Fonttools

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2023-45139",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-45139",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
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          ],
          "version": "2.0.3",
          "timestamp": "2025-05-08T18:37:10.491503Z"
        }
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    "cvssMetricV31": [
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
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      {
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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          "versions": [
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  "published": "2024-01-10T16:15:46.767",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
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      "description": [
        {
          "lang": "en",
          "value": "CWE-611"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "fontTools is a library for manipulating fonts, written in Python. The subsetting module has a XML External Entity Injection (XXE) vulnerability which allows an attacker to resolve arbitrary entities when a candidate font (OT-SVG fonts), which contains a SVG table, is parsed. This allows attackers to include arbitrary files from the filesystem fontTools is running on or make web requests from the host system. This vulnerability has been patched in version 4.43.0."
    },
    {
      "lang": "es",
      "value": "fontTools es una librería para manipular fuentes, escrita en Python. El módulo subsetting tiene una vulnerabilidad de inyección de entidades externas XML (XXE) que permite a un atacante resolver entidades arbitrarias cuando se analiza una fuente candidata (fuentes OT-SVG), que contiene una tabla SVG. Esto permite a los atacantes incluir archivos arbitrarios del sistema de archivos en el que se ejecuta fontTools o realizar solicitudes web desde el sistema host. Esta vulnerabilidad ha sido parcheada en la versión 4.43.0."
    }
  ],
  "lastModified": "2026-06-17T06:28:17.890",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}