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CVE-2020-26307

Estado: AplazadaAlta (8.7)—

HTML2Markdown is a Javascript implementation for converting HTML to Markdown text. All available versions contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, no known patches are available.

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.

Vulnerabilidad ReDoS en librería JavaScript expuesta en red (AV:N, PR:N, UI:N); ataque remoto sin autenticación causa negación de servicio (VA:H) mediante expresiones regulares malformadas.

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

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication 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.

Html2markdown — Html2markdownAI

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2020-26307",
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          "role": "CISA Coordinator",
          "options": [
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          "version": "2.0.3",
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          "Automatable": "NOT_DEFINED",
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          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
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          "exploitMaturity": "NOT_DEFINED",
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          "integrityRequirement": "NOT_DEFINED",
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          "modifiedUserInteraction": "NOT_DEFINED",
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          "vulnConfidentialityImpact": "NONE",
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          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  "affected": [
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      "affectedData": [
        {
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          "versions": [
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  "published": "2024-10-26T21:15:13.980",
  "references": [
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      "url": "https://github.com/kates/html2markdown/issues/13",
      "source": "security-advisories@github.com"
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      "url": "https://securitylab.github.com/advisories/GHSL-2020-301-redos-HTML2Markdown/",
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  "vulnStatus": "Deferred",
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      "description": [
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          "value": "CWE-1333"
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      "lang": "en",
      "value": "HTML2Markdown is a Javascript implementation for converting HTML to Markdown text. All available versions contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, no known patches are available."
    },
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    }
  ],
  "lastModified": "2026-06-17T03:08:02.843",
  "sourceIdentifier": "security-advisories@github.com"
}