Vulnerability-Lookup

FKIE_CVE-2026-21710

Vulnerability from fkie_nvd - Published: 2026-03-30 20:16 - Updated: 2026-08-19 14:32

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

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**

References

URL	Tags
support@hackerone.com	https://nodejs.org/en/blog/vulnerability/march-2026-security-releases	Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:7080	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:7123	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:7302	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:7310	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:7350	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:7670	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:7675	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:7896	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:7983	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:8339	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:9711	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:9874	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-21710	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2453151	Issue Tracking
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21710.json	Third Party Advisory

Impacted products

Vendor	Product	Version
nodejs	node.js	*
nodejs	node.js	*
nodejs	node.js	*
nodejs	node.js	*
redhat	enterprise_linux	8.0
redhat	enterprise_linux	9.0
redhat	enterprise_linux	10.0
redhat	enterprise_linux_eus	9.4
redhat	enterprise_linux_eus	9.6
redhat	enterprise_linux_eus	10.0

JSON

To clipboard

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      "value": "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**"
    },
    {
      "lang": "es",
      "value": "Un fallo en el manejo de solicitudes HTTP de Node.js provoca un \u0027TypeError\u0027 no capturado cuando se recibe una solicitud con un encabezado llamado \u0027__proto__\u0027 y la aplicaci\u00f3n accede a \u0027req.headersDistinct\u0027.\n\nCuando esto ocurre, \u0027dest[\"__proto__\"]\u0027 se resuelve como \u0027Object.prototype\u0027 en lugar de \u0027undefined\u0027, lo que provoca que se llame a \u0027.push()\u0027 en un no-array. Esta excepci\u00f3n se lanza sincr\u00f3nicamente dentro de un accesor de propiedad y no puede ser interceptada por los oyentes de eventos \u0027error\u0027, lo que significa que no puede ser manejada sin envolver cada acceso a \u0027req.headersDistinct\u0027 en un \u0027try/catch\u0027.\n\n* Esta vulnerabilidad afecta a todos los servidores HTTP de Node.js en 20.x, 22.x, 24.x y v25.x"
    }
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  "lastModified": "2026-08-19T14:32:04.833",
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CVE-2026-21710 (GCVE-0-2026-21710)

Vulnerability from cvelistv5 – Published: 2026-03-30 19:07 – Updated: 2026-07-15 01:19

Summary

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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-31 13:55 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling
CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')

Assigner

hackerone mitre root Scorecard

References

16 references

URL	Tags
https://nodejs.org/en/blog/vulnerability/march-20…
https://access.redhat.com/security/cve/CVE-2026-21710	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2453151	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:7310	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7080	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7675	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8339	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7123	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7670	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:9711	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:9874	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7983	vendor-advisoryx_refsource_REDHAT
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https://access.redhat.com/errata/RHSA-2026:7302	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7350	vendor-advisoryx_refsource_REDHAT

Impacted products

13 products

Vendor	Product	Version
nodejs	node	Affected: 20.20.1 , ≤ 20.20.1 (semver) Affected: 22.22.1 , ≤ 22.22.1 (semver) Affected: 24.14.0 , ≤ 24.14.0 (semver) Affected: 25.8.1 , ≤ 25.8.1 (semver) Affected: 4.0 , < 4.* (semver) Affected: 5.0 , < 5.* (semver) Affected: 6.0 , < 6.* (semver) Affected: 7.0 , < 7.* (semver) Affected: 8.0 , < 8.* (semver) Affected: 9.0 , < 9.* (semver) Affected: 10.0 , < 10.* (semver) Affected: 11.0 , < 11.* (semver) Affected: 12.0 , < 12.* (semver) Affected: 13.0 , < 13.* (semver) Affected: 14.0 , < 14.* (semver) Affected: 15.0 , < 15.* (semver) Affected: 16.0 , < 16.* (semver) Affected: 17.0 , < 17.* (semver) Affected: 18.0 , < 18.* (semver) Affected: 19.0 , < 19.* (semver)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 1:22.22.2-1.el10_1 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.1
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 1:24.14.1-2.el10_1 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.1
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	Unaffected: 1:22.22.2-2.el10_0 , < * (rpm) cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 8100020260331102257.6d880403 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 8100020260408131901.6d880403 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 8100020260414073138.489197e6 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 9070020260401095228.rhel9 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 9070020260402152654.rhel9 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 9070020260409073121.rhel9 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9.4 Extended Update Support	Unaffected: 9040020260421133644.rhel9 , < * (rpm) cpe:/a:redhat:rhel_eus:9.4
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 9060020260409121057.rhel9 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 9060020260422064119.rhel9 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6

Show details on NVD website

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              "lessThan": "9.*",
              "status": "affected",
              "version": "9.0",
              "versionType": "semver"
            },
            {
              "lessThan": "10.*",
              "status": "affected",
              "version": "10.0",
              "versionType": "semver"
            },
            {
              "lessThan": "11.*",
              "status": "affected",
              "version": "11.0",
              "versionType": "semver"
            },
            {
              "lessThan": "12.*",
              "status": "affected",
              "version": "12.0",
              "versionType": "semver"
            },
            {
              "lessThan": "13.*",
              "status": "affected",
              "version": "13.0",
              "versionType": "semver"
            },
            {
              "lessThan": "14.*",
              "status": "affected",
              "version": "14.0",
              "versionType": "semver"
            },
            {
              "lessThan": "15.*",
              "status": "affected",
              "version": "15.0",
              "versionType": "semver"
            },
            {
              "lessThan": "16.*",
              "status": "affected",
              "version": "16.0",
              "versionType": "semver"
            },
            {
              "lessThan": "17.*",
              "status": "affected",
              "version": "17.0",
              "versionType": "semver"
            },
            {
              "lessThan": "18.*",
              "status": "affected",
              "version": "18.0",
              "versionType": "semver"
            },
            {
              "lessThan": "19.*",
              "status": "affected",
              "version": "19.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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**"
        }
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.0"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-30T19:07:28.558Z",
        "orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
        "shortName": "hackerone"
      },
      "references": [
        {
          "url": "https://nodejs.org/en/blog/vulnerability/march-2026-security-releases"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
    "assignerShortName": "hackerone",
    "cveId": "CVE-2026-21710",
    "datePublished": "2026-03-30T19:07:28.558Z",
    "dateReserved": "2026-01-04T15:00:06.574Z",
    "dateUpdated": "2026-07-15T01:19:57.306Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

FKIE_CVE-2026-21710

CVE-2026-21710 (GCVE-0-2026-21710)

Tags

Sightings

Nomenclature

Related by attack behaviour