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CVE-2022-34749

Estado: ModificadaAlta (7.5)—

In mistune through 2.0.2, support of inline markup is implemented by using regular expressions that can involve a high amount of backtracking on certain edge cases. This behavior is commonly named catastrophic backtracking.

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 (2)

Fedoraproject — FedoraMistune Project — Mistune

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2022-34749",
  "cveTags": [],
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 3.9
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  "affected": [
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  "published": "2022-07-25T23:15:07.837",
  "references": [
    {
      "url": "https://github.com/lepture/mistune/commit/a6d43215132fe4f3d93f8d7e90ba83b16a0838b2",
      "tags": [
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        "Third Party Advisory"
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      "tags": [
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        "Third Party Advisory"
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    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQHXITQ2DSBYOILKHXBSBB7PFBPZHF63/",
      "source": "cve@mitre.org"
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-1333"
        }
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  ],
  "descriptions": [
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      "lang": "en",
      "value": "In mistune through 2.0.2, support of inline markup is implemented by using regular expressions that can involve a high amount of backtracking on certain edge cases. This behavior is commonly named catastrophic backtracking."
    },
    {
      "lang": "es",
      "value": "En mistune versiones hasta 2.0.2, la compatibilidad con el marcado en línea es implementado mediante el uso de expresiones regulares que pueden implicar una gran cantidad de retroceso en determinados casos límite. Este comportamiento es comúnmente llamado backtracking catastrófico."
    }
  ],
  "lastModified": "2026-06-17T04:50:51.650",
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