Vulnerability from bitnami_vulndb
Published
2026-04-06 07:58
Modified
2026-04-06 08:26
Summary
Details

A flaw in Node.js HTTP request handling causes an uncaught TypeError when a request is received with a header named __proto__ and the application accesses req.headersDistinct.

When this occurs, dest["__proto__"] resolves to Object.prototype rather than undefined, causing .push() to be called on a non-array. This exception is thrown synchronously inside a property getter and cannot be intercepted by error event listeners, meaning it cannot be handled without wrapping every req.headersDistinct access in a try/catch.

  • This vulnerability affects all Node.js HTTP servers on 20.x, 22.x, 24.x, and v25.x
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "node",
        "purl": "pkg:bitnami/node"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "20.20.2"
            },
            {
              "introduced": "21.0.0"
            },
            {
              "fixed": "24.14.1"
            },
            {
              "introduced": "25.0.0"
            },
            {
              "fixed": "25.8.2"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-21710"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:nodejs:node.js:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "A flaw in Node.js HTTP request handling causes an uncaught `TypeError` when a request is received with a header named `__proto__` and the application accesses `req.headersDistinct`.\r\n\r\nWhen this occurs, `dest[\"__proto__\"]` resolves to `Object.prototype` rather than `undefined`, causing `.push()` to be called on a non-array. This exception is thrown synchronously inside a property getter and cannot be intercepted by `error` event listeners, meaning it cannot be handled without wrapping every `req.headersDistinct` access in a `try/catch`.\r\n\r\n* This vulnerability affects all Node.js HTTP servers on **20.x, 22.x, 24.x, and v25.x**",
  "id": "BIT-node-2026-21710",
  "modified": "2026-04-06T08:26:41.107Z",
  "published": "2026-04-06T07:58:28.068Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://nodejs.org/en/blog/vulnerability/march-2026-security-releases"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21710"
    }
  ],
  "schema_version": "1.6.2"
}


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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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