FKIE_CVE-2026-22864

Vulnerability from fkie_nvd - Published: 2026-01-15 23:15 - Updated: 2026-01-21 14:32
Severity ?
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/denoland/deno/releases/tag/v2.5.6Release Notes
security-advisories@github.comhttps://github.com/denoland/deno/security/advisories/GHSA-m3c4-prhw-mrx6Exploit, Vendor Advisory
Impacted products
Vendor Product Version
deno deno *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D302E8AF-7ACC-4470-B0AB-B865727AE026",
              "versionEndExcluding": "2.5.6",
              "vulnerable": true
            }
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          "negate": false,
          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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\u2019s 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."
    },
    {
      "lang": "es",
      "value": "Deno es un entorno de ejecuci\u00f3n de JavaScript, TypeScript y WebAssembly. Antes de 2.5.6, un parche anterior ten\u00eda como objetivo bloquear la ejecuci\u00f3n de archivos batch/shell de Windows devolviendo un error cuando la extensi\u00f3n de una ruta ejecutada coincid\u00eda con .bat o .cmd. Esa verificaci\u00f3n realiza una comparaci\u00f3n que distingue entre may\u00fasculas y min\u00fasculas contra literales en min\u00fasculas y por lo tanto puede ser eludida cuando la extensi\u00f3n utiliza un uso de may\u00fasculas y min\u00fasculas alternativo (por ejemplo, .BAT, .Bat, etc.). Esta vulnerabilidad est\u00e1 corregida en 2.5.6."
    }
  ],
  "id": "CVE-2026-22864",
  "lastModified": "2026-01-21T14:32:39.837",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  },
  "published": "2026-01-15T23:15:51.937",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
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      ],
      "url": "https://github.com/denoland/deno/releases/tag/v2.5.6"
    },
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      "source": "security-advisories@github.com",
      "tags": [
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        "Vendor Advisory"
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      "url": "https://github.com/denoland/deno/security/advisories/GHSA-m3c4-prhw-mrx6"
    }
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-77"
        }
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      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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