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ubuntu-cve-2026-21710
Vulnerability from osv_ubuntu
Published
2026-03-30 20:16
Modified
2026-06-30 16:18
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

Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nodejs",
            "binary_version": "0.10.25~dfsg2-2ubuntu1.2+esm2"
          },
          {
            "binary_name": "nodejs-legacy",
            "binary_version": "0.10.25~dfsg2-2ubuntu1.2+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "nodejs",
        "purl": "pkg:deb/ubuntu/nodejs@0.10.25~dfsg2-2ubuntu1.2+esm2?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.10.15~dfsg1-4",
        "0.10.21~dfsg1-1",
        "0.10.22~dfsg1-2",
        "0.10.23~dfsg1-1",
        "0.10.23~dfsg1-2",
        "0.10.23~dfsg1-3",
        "0.10.24~dfsg1-1",
        "0.10.25~dfsg2-2",
        "0.10.25~dfsg2-2ubuntu1",
        "0.10.25~dfsg2-2ubuntu1.2",
        "0.10.25~dfsg2-2ubuntu1.2+esm1",
        "0.10.25~dfsg2-2ubuntu1.2+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nodejs",
            "binary_version": "4.2.6~dfsg-1ubuntu4.2+esm3"
          },
          {
            "binary_name": "nodejs-legacy",
            "binary_version": "4.2.6~dfsg-1ubuntu4.2+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "nodejs",
        "purl": "pkg:deb/ubuntu/nodejs@4.2.6~dfsg-1ubuntu4.2+esm3?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.10.25~dfsg2-2ubuntu1",
        "4.2.2~dfsg-1",
        "4.2.3~dfsg-1",
        "4.2.4~dfsg-1ubuntu1",
        "4.2.4~dfsg-2",
        "4.2.6~dfsg-1ubuntu1",
        "4.2.6~dfsg-1ubuntu4",
        "4.2.6~dfsg-1ubuntu4.1",
        "4.2.6~dfsg-1ubuntu4.2",
        "4.2.6~dfsg-1ubuntu4.2+esm1",
        "4.2.6~dfsg-1ubuntu4.2+esm2",
        "4.2.6~dfsg-1ubuntu4.2+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nodejs",
            "binary_version": "8.10.0~dfsg-2ubuntu0.4+esm6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "nodejs",
        "purl": "pkg:deb/ubuntu/nodejs@8.10.0~dfsg-2ubuntu0.4+esm6?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.11.4~dfsg-1ubuntu1",
        "6.11.4~dfsg-1ubuntu2",
        "6.12.0~dfsg-1ubuntu1",
        "6.12.0~dfsg-2ubuntu1",
        "6.12.0~dfsg-2ubuntu2",
        "8.10.0~dfsg-2",
        "8.10.0~dfsg-2ubuntu0.2",
        "8.10.0~dfsg-2ubuntu0.3",
        "8.10.0~dfsg-2ubuntu0.4",
        "8.10.0~dfsg-2ubuntu0.4+esm1",
        "8.10.0~dfsg-2ubuntu0.4+esm2",
        "8.10.0~dfsg-2ubuntu0.4+esm3",
        "8.10.0~dfsg-2ubuntu0.4+esm4",
        "8.10.0~dfsg-2ubuntu0.4+esm5",
        "8.10.0~dfsg-2ubuntu0.4+esm6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnode64",
            "binary_version": "10.19.0~dfsg-3ubuntu1.6+esm2"
          },
          {
            "binary_name": "nodejs",
            "binary_version": "10.19.0~dfsg-3ubuntu1.6+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "nodejs",
        "purl": "pkg:deb/ubuntu/nodejs@10.19.0~dfsg-3ubuntu1.6+esm2?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "10.15.2~dfsg-2ubuntu1",
        "10.17.0~dfsg-2ubuntu4",
        "10.17.0~dfsg-2ubuntu6",
        "10.19.0~dfsg-3ubuntu1",
        "10.19.0~dfsg-3ubuntu1.1",
        "10.19.0~dfsg-3ubuntu1.2",
        "10.19.0~dfsg-3ubuntu1.3",
        "10.19.0~dfsg-3ubuntu1.5",
        "10.19.0~dfsg-3ubuntu1.6",
        "10.19.0~dfsg-3ubuntu1.6+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnode72",
            "binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2"
          },
          {
            "binary_name": "nodejs",
            "binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "nodejs",
        "purl": "pkg:deb/ubuntu/nodejs@12.22.9~dfsg-1ubuntu3.6+esm2?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "12.22.5~dfsg-5ubuntu1",
        "12.22.7~dfsg-2ubuntu1",
        "12.22.7~dfsg-2ubuntu3",
        "12.22.9~dfsg-1ubuntu2",
        "12.22.9~dfsg-1ubuntu3",
        "12.22.9~dfsg-1ubuntu3.1",
        "12.22.9~dfsg-1ubuntu3.2",
        "12.22.9~dfsg-1ubuntu3.3",
        "12.22.9~dfsg-1ubuntu3.4",
        "12.22.9~dfsg-1ubuntu3.5",
        "12.22.9~dfsg-1ubuntu3.6",
        "12.22.9~dfsg-1ubuntu3.6+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnode109",
            "binary_version": "18.19.1+dfsg-6ubuntu5"
          },
          {
            "binary_name": "nodejs",
            "binary_version": "18.19.1+dfsg-6ubuntu5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "nodejs",
        "purl": "pkg:deb/ubuntu/nodejs@18.19.1+dfsg-6ubuntu5?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "18.13.0+dfsg1-1ubuntu2",
        "18.19.1+dfsg-2ubuntu4",
        "18.19.1+dfsg-6ubuntu1",
        "18.19.1+dfsg-6ubuntu2",
        "18.19.1+dfsg-6ubuntu5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnode115",
            "binary_version": "20.19.4+dfsg-1"
          },
          {
            "binary_name": "nodejs",
            "binary_version": "20.19.4+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "nodejs",
        "purl": "pkg:deb/ubuntu/nodejs@20.19.4+dfsg-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.18.1+dfsg-1ubuntu2",
        "20.19.2+dfsg-1",
        "20.19.4+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnode127",
            "binary_version": "22.22.1+dfsg+~cs22.19.15-1ubuntu1"
          },
          {
            "binary_name": "nodejs",
            "binary_version": "22.22.1+dfsg+~cs22.19.15-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "nodejs",
        "purl": "pkg:deb/ubuntu/nodejs@22.22.1+dfsg+~cs22.19.15-1ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.19.4+dfsg-1",
        "20.19.5+dfsg+~cs20.19.12-4",
        "22.21.1+dfsg+~cs22.19.0-6ubuntu4",
        "22.22.0+dfsg+~cs22.19.6-1ubuntu2",
        "22.22.0+dfsg+~cs22.19.13-2ubuntu1",
        "22.22.1+dfsg+~cs22.19.15-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "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**",
  "id": "UBUNTU-CVE-2026-21710",
  "modified": "2026-06-30T16:18:44Z",
  "published": "2026-03-30T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-21710"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-21710"
    },
    {
      "type": "REPORT",
      "url": "https://nodejs.org/en/blog/vulnerability/march-2026-security-releases#denial-of-service-via-__proto__-header-name-in-reqheadersdistinct-uncaught-typeerror-crashes-nodejs-process-cve-2026-21710---high"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-21710"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.