Vulnerability-Lookup

GHSA-WF42-42FG-FG84

Vulnerability from github – Published: 2026-03-17 18:38 – Updated: 2026-03-20 21:21

Summary

Nest Fastify HEAD Request Middleware Bypass

Details

Impact

In a NestJS application using @nestjs/platform-fastify, GET middleware can be bypassed because Fastify automatically redirects HEAD requests to the corresponding GET handlers (if they exist).

As a result:

Middleware will be completely skipped.
The HTTP response won't include a body (since the response is truncated when redirecting a HEAD request to a GET handler).
The actual handler will still be executed.

Patches

Fixed in @nestjs/platform-fastify@11.1.16

Severity

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 11.1.15"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@nestjs/platform-fastify"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "11.1.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33011"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-670"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-17T18:38:38Z",
    "nvd_published_at": "2026-03-20T05:16:15Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nIn a NestJS application using `@nestjs/platform-fastify`, GET middleware can be bypassed because Fastify automatically redirects HEAD requests to the corresponding GET handlers (if they exist).\n\nAs a result:\n\n- Middleware will be completely skipped.\n- The HTTP response won\u0027t include a body (since the response is truncated when redirecting a HEAD request to a GET handler).\n- The actual handler will still be executed.\n\n### Patches\n\nFixed in `@nestjs/platform-fastify@11.1.16`",
  "id": "GHSA-wf42-42fg-fg84",
  "modified": "2026-03-20T21:21:43Z",
  "published": "2026-03-17T18:38:38Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nestjs/nest/security/advisories/GHSA-wf42-42fg-fg84"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33011"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nestjs/nest/commit/cbdf737cd6e7cefa52d05ecea2ae4af95c464614"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nestjs/nest"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nestjs/nest/releases/tag/v11.1.17"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Nest Fastify HEAD Request Middleware Bypass"
}

CVE-2026-33011 (GCVE-0-2026-33011)

Vulnerability from cvelistv5 – Published: 2026-03-20 04:37 – Updated: 2026-03-20 15:48

Title

Nest Fastify HEAD Request Middleware Bypass

Summary

Nest is a framework for building scalable Node.js server-side applications. In versions 11.1.15 and below, a NestJS application using @nestjs/platform-fastify GET middleware can be bypassed because Fastify automatically redirects HEAD requests to the corresponding GET handlers (if they exist). As a result: middleware will be completely skipped, the HTTP response won't include a body (since the response is truncated when redirecting a HEAD request to a GET handler), and the actual handler will still be executed. This issue is fixed in version 11.1.16.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-20 15:48 UTC

CWE

CWE-670 - Always-Incorrect Control Flow Implementation

Assigner

GitHub_M mitre root Scorecard

References

3 references

URL	Tags
https://github.com/nestjs/nest/security/advisorie…	x_refsource_CONFIRM
https://github.com/nestjs/nest/commit/cbdf737cd6e…	x_refsource_MISC
https://github.com/nestjs/nest/releases/tag/v11.1.17	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
nestjs	nest	Affected: < 11.1.16

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33011",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-20T15:48:14.460494Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-20T15:48:23.564Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "nest",
          "vendor": "nestjs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 11.1.16"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Nest is a framework for building scalable Node.js server-side applications. In versions 11.1.15 and below, a NestJS application using @nestjs/platform-fastify GET middleware can be bypassed because Fastify automatically redirects HEAD requests to the corresponding GET handlers (if they exist). As a result: middleware will be completely skipped, the HTTP response won\u0027t include a body (since the response is truncated when redirecting a HEAD request to a GET handler), and the actual handler will still be executed. This issue is fixed in version 11.1.16."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-670",
              "description": "CWE-670: Always-Incorrect Control Flow Implementation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-20T04:37:15.044Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nestjs/nest/security/advisories/GHSA-wf42-42fg-fg84",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nestjs/nest/security/advisories/GHSA-wf42-42fg-fg84"
        },
        {
          "name": "https://github.com/nestjs/nest/commit/cbdf737cd6e7cefa52d05ecea2ae4af95c464614",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nestjs/nest/commit/cbdf737cd6e7cefa52d05ecea2ae4af95c464614"
        },
        {
          "name": "https://github.com/nestjs/nest/releases/tag/v11.1.17",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nestjs/nest/releases/tag/v11.1.17"
        }
      ],
      "source": {
        "advisory": "GHSA-wf42-42fg-fg84",
        "discovery": "UNKNOWN"
      },
      "title": "Nest Fastify HEAD Request Middleware Bypass"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33011",
    "datePublished": "2026-03-20T04:37:15.044Z",
    "dateReserved": "2026-03-17T17:22:14.664Z",
    "dateUpdated": "2026-03-20T15:48:23.564Z",
    "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.

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