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CVE-2026-21716

Estado: AnalizadaBaja (3.3)—

An incomplete fix for CVE-2024-36137 leaves `FileHandle.chmod()` and `FileHandle.chown()` in the promises API without the required permission checks, while their callback-based equivalents (`fs.fchmod()`, `fs.fchown()`) were correctly patched.

As a result, code running under `--permission` with restricted `--allow-fs-write` can still use promise-based `FileHandle` methods to modify file permissions and ownership on already-open file descriptors, bypassing the intended write restrictions.

This vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-write` is intentionally restricted.

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)

Nodejs — Node.js

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-21716",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-21716",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-31T14:27:06.373734Z"
        }
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Secondary",
        "source": "support@hackerone.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 3.3,
          "attackVector": "LOCAL",
          "baseSeverity": "LOW",
          "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "support@hackerone.com",
      "affectedData": [
        {
          "vendor": "nodejs",
          "product": "node",
          "versions": [
            {
              "status": "affected",
              "version": "20.20.1",
              "versionType": "semver",
              "lessThanOrEqual": "20.20.1"
            },
            {
              "status": "affected",
              "version": "22.22.1",
              "versionType": "semver",
              "lessThanOrEqual": "22.22.1"
            },
            {
              "status": "affected",
              "version": "24.14.0",
              "versionType": "semver",
              "lessThanOrEqual": "24.14.0"
            },
            {
              "status": "affected",
              "version": "25.8.1",
              "versionType": "semver",
              "lessThanOrEqual": "25.8.1"
            }
          ],
          "defaultStatus": "unaffected"
        }
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  ],
  "published": "2026-03-30T20:16:19.873",
  "references": [
    {
      "url": "https://nodejs.org/en/blog/vulnerability/march-2026-security-releases",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "support@hackerone.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An incomplete fix for CVE-2024-36137 leaves `FileHandle.chmod()` and `FileHandle.chown()` in the promises API without the required permission checks, while their callback-based equivalents (`fs.fchmod()`, `fs.fchown()`) were correctly patched.\r\n\r\nAs a result, code running under `--permission` with restricted `--allow-fs-write` can still use promise-based `FileHandle` methods to modify file permissions and ownership on already-open file descriptors, bypassing the intended write restrictions.\r\n\r\nThis vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-write` is intentionally restricted."
    },
    {
      "lang": "es",
      "value": "Una solución incompleta para CVE-2024-36137 deja `FileHandle.chmod()` y `FileHandle.chown()` en la API de promesas sin las comprobaciones de permisos requeridas, mientras que sus equivalentes basados en callbacks (`fs.fchmod()`, `fs.fchown()`) fueron parcheados correctamente.\n\nComo resultado, el código que se ejecuta bajo `--permission` con `--allow-fs-write` restringido aún puede usar métodos `FileHandle` basados en promesas para modificar los permisos y la propiedad de los archivos en descriptores de archivo ya abiertos, eludiendo las restricciones de escritura previstas.\n\nEsta vulnerabilidad afecta a los procesos 20.x, 22.x, 24.x y 25.x que utilizan el Modelo de Permisos donde `--allow-fs-write` está restringido intencionalmente."
    }
  ],
  "lastModified": "2026-08-19T13:18:02.937",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "42C896A4-ABB4-4DF3-8F8B-320C8E8E6AA3",
              "versionEndIncluding": "20.20.1"
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              "vulnerable": true,
              "matchCriteriaId": "5317F856-6549-4E7C-B6B8-811DE991E7A7",
              "versionEndIncluding": "22.22.1",
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            },
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              "vulnerable": true,
              "matchCriteriaId": "DD9D3210-E42B-4584-817D-DAC5F1234234",
              "versionEndIncluding": "24.14.0",
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            },
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              "matchCriteriaId": "89D03065-041A-4A59-95C4-B2AE7EE36439",
              "versionEndIncluding": "25.8.1",
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          "operator": "OR"
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  "sourceIdentifier": "support@hackerone.com"
}