Vulnerability-Lookup

CVE-2026-74866 (GCVE-0-2026-74866)

Vulnerability from cvelistv5 – Published: 2026-08-21 08:20 – Updated: 2026-08-21 12:37

Title

@fastify/busboy vulnerable to CRLF injection via multipart Content-Disposition filename and name

Summary

@fastify/busboy is a multipart form-data parser for Node.js. Its multipart part-header parser splits header lines only on the two-byte carriage-return line-feed sequence, so a lone carriage return or line feed embedded in a part header is not treated as a line break and is carried verbatim into the parsed Content-Disposition filename and field name handed to the application. An attacker who uploads a file whose filename or field name contains a bare carriage return or line feed can inject control characters into consumers that trust the parser to return clean values, enabling filesystem filename pollution, log forging, or header injection when the value is forwarded to a carriage-return-sensitive sink. All versions of @fastify/busboy up to and including 3.2.1 are affected. The issue is fixed in version 3.2.2, which rejects any header line that still contains a bare carriage return or line feed. Users should upgrade to 3.2.2, and consumers such as @fastify/multipart should bump their @fastify/busboy dependency to pull in the fix.

Severity

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 12:35 UTC

CWE

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Assigner

openjs CNA under the redhat root

CNA scorecard C 65/100 over 108 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/fastify/busboy/security/adviso…
https://cna.openjsf.org/security-advisories.html

Impacted products

1 product

Vendor	Product	Version	CPE status
@fastify/busboy	@fastify/busboy	Affected: 0 , < 3.2.2 (semver) Unaffected: 3.2.2 (semver)	guessed

Credits

tonghuaroot mcollina UlisesGascon

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-74866

Vulnerability from fkie_nvd - Published: 2026-08-21 09:16 - Updated: 2026-10-16 15:10

Severity

5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Summary

References

	URL	Tags
	ce714d77-add3-4f53-aff5-83d477b104bb	https://cna.openjsf.org/security-advisories.html	Third Party Advisory
	ce714d77-add3-4f53-aff5-83d477b104bb	https://github.com/fastify/busboy/security/advisories/GHSA-gxm5-99cw-xjw9	Vendor Advisory

Impacted products

	Vendor	Product	Version
	fastify	fastify\/busyboy	*

JSON

To clipboard

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    {
      "lang": "es",
      "value": "@fastify/busboy es un analizador de datos de formulario multipart para Node.js. Su analizador de encabezados de parte multipart divide las l\u00edneas de encabezado solo en la secuencia de dos bytes de retorno de carro y salto de l\u00ednea, por lo que un retorno de carro o salto de l\u00ednea solitario incrustado en un encabezado de parte no se trata como un salto de l\u00ednea y se transfiere textualmente al nombre de archivo y nombre de campo de Content-Disposition analizados entregados a la aplicaci\u00f3n. Un atacante que carga un archivo cuyo nombre de archivo o nombre de campo contiene un retorno de carro o salto de l\u00ednea simple puede inyectar caracteres de control en consumidores que conf\u00edan en que el analizador devuelva valores limpios, lo que permite la contaminaci\u00f3n de nombres de archivo del sistema de archivos, la falsificaci\u00f3n de registros o la inyecci\u00f3n de encabezados cuando el valor se reenv\u00eda a un sumidero sensible al retorno de carro. Todas las versiones de @fastify/busboy hasta la 3.2.1 inclusive est\u00e1n afectadas. El problema est\u00e1 solucionado en la versi\u00f3n 3.2.2, la cual rechaza cualquier l\u00ednea de encabezado que a\u00fan contenga un retorno de carro o salto de l\u00ednea simple. Los usuarios deben actualizar a la versi\u00f3n 3.2.2, y los consumidores, como @fastify/multipart, deben actualizar su dependencia de @fastify/busboy para incorporar la soluci\u00f3n."
    }
  ],
  "id": "CVE-2026-74866",
  "lastModified": "2026-10-16T15:10:00.103",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-74866",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-21T12:35:38.937723Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-21T09:16:40.890",
  "references": [
    {
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/fastify/busboy/security/advisories/GHSA-gxm5-99cw-xjw9"
    }
  ],
  "sourceIdentifier": "ce714d77-add3-4f53-aff5-83d477b104bb",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-93"
        }
      ],
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "type": "Secondary"
    }
  ]
}

GHSA-GXM5-99CW-XJW9

Vulnerability from github – Published: 2026-10-05 22:33 – Updated: 2026-10-05 22:33

Summary

@fastify/busboy vulnerable to CRLF injection via multipart Content-Disposition filename and name

Details

Impact

@fastify/busboy 3.2.1 and earlier retains a bare carriage return or line feed inside the parsed Content-Disposition parameters returned to the application. The multipart header parser ends a header line only on the two-byte \r\n sequence, so a lone CR or LF embedded in a part header is carried verbatim into the filename and field name delivered by the file and field events. An application that forwards the supplied filename or name into a CR/LF-sensitive sink cannot anticipate the embedded control character.

An attacker who uploads a file whose filename or field name contains a bare CR or LF can pollute filenames on disk when the upload is saved under its original name, inject forged lines into logs, or inject headers on a downstream hop that does not re-validate CR/LF, such as object-storage metadata or a proxied backend. Applications using @fastify/busboy directly, or through @fastify/multipart and its consumers, are affected.

Patches

Upgrade to @fastify/busboy 3.2.2 or later.

Workarounds

Validate or strip carriage return and line feed characters from the filename and field name before using them in any filesystem, logging, or outbound-header context.

Severity

5.8 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Show details on source website

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To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@fastify/busboy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-74866"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-93"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-05T22:33:44Z",
    "nvd_published_at": "2026-08-21T09:16:40Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\n`@fastify/busboy` 3.2.1 and earlier retains a bare carriage return or line feed inside the parsed `Content-Disposition` parameters returned to the application. The multipart header parser ends a header line only on the two-byte `\\r\\n` sequence, so a lone CR or LF embedded in a part header is carried verbatim into the `filename` and field `name` delivered by the `file` and `field` events. An application that forwards the supplied filename or name into a CR/LF-sensitive sink cannot anticipate the embedded control character.\n\nAn attacker who uploads a file whose `filename` or field `name` contains a bare CR or LF can pollute filenames on disk when the upload is saved under its original name, inject forged lines into logs, or inject headers on a downstream hop that does not re-validate CR/LF, such as object-storage metadata or a proxied backend. Applications using `@fastify/busboy` directly, or through `@fastify/multipart` and its consumers, are affected.\n\n### Patches\n\nUpgrade to `@fastify/busboy` 3.2.2 or later.\n\n### Workarounds\n\nValidate or strip carriage return and line feed characters from the `filename` and field `name` before using them in any filesystem, logging, or outbound-header context.",
  "id": "GHSA-gxm5-99cw-xjw9",
  "modified": "2026-10-05T22:33:44Z",
  "published": "2026-10-05T22:33:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fastify/busboy/security/advisories/GHSA-gxm5-99cw-xjw9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74866"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/busboy/commit/cc7da17c5c88d79c314a9e149a79e5a00a6c23be"
    },
    {
      "type": "WEB",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/fastify/busboy"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/busboy/releases/tag/v3.2.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@fastify/busboy vulnerable to CRLF injection via multipart Content-Disposition filename and name"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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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.
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Action not permitted

CVE-2026-74866 (GCVE-0-2026-74866)

FKIE_CVE-2026-74866

GHSA-GXM5-99CW-XJW9

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