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CVE-2026-22864

Estado: AnalizadaCrítica (9.8)—

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Before 2.5.6, a prior patch aimed to block spawning Windows batch/shell files by returning an error when a spawned path’s extension matched .bat or .cmd. That check performs a case-sensitive comparison against lowercase literals and therefore can be bypassed when the extension uses alternate casing (for example .BAT, .Bat, etc.). This vulnerability is fixed in 2.5.6.

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.

Vector AV:N/PR:N/UI:N indica acceso remoto sin privilegios. El bypass case-sensitive permite ejecutar .bat/.cmd evadiendo restricciones de seguridad, resultando en ejecución de comandos. Potencialmente escala de privilegios si el proceso tiene permisos elevados.

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

Privileged Account ManagementExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareVulnerability Scanning

Tecnologías afectadas (1)

Deno — Deno

CWE

Referencias

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{
  "id": "CVE-2026-22864",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-22864",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
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              "technicalImpact": "total"
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          ],
          "version": "2.0.3",
          "timestamp": "2026-01-16T17:15:35.078037Z"
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          "privilegesRequired": "NONE",
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  "published": "2026-01-15T23:15:51.937",
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  "weaknesses": [
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      "value": "Deno is a JavaScript, TypeScript, and WebAssembly runtime. Before 2.5.6, a prior patch aimed to block spawning Windows batch/shell files by returning an error when a spawned path’s extension matched .bat or .cmd. That check performs a case-sensitive comparison against lowercase literals and therefore can be bypassed when the extension uses alternate casing (for example .BAT, .Bat, etc.). This vulnerability is fixed in 2.5.6."
    },
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      "value": "Deno es un entorno de ejecución de JavaScript, TypeScript y WebAssembly. Antes de 2.5.6, un parche anterior tenía como objetivo bloquear la ejecución de archivos batch/shell de Windows devolviendo un error cuando la extensión de una ruta ejecutada coincidía con .bat o .cmd. Esa verificación realiza una comparación que distingue entre mayúsculas y minúsculas contra literales en minúsculas y por lo tanto puede ser eludida cuando la extensión utiliza un uso de mayúsculas y minúsculas alternativo (por ejemplo, .BAT, .Bat, etc.). Esta vulnerabilidad está corregida en 2.5.6."
    }
  ],
  "lastModified": "2026-06-17T10:20:31.700",
  "configurations": [
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