Vulnerability-Lookup

CVE-2026-6270 (GCVE-0-2026-6270)

Vulnerability from cvelistv5 – Published: 2026-04-16 13:44 – Updated: 2026-04-16 14:24

Title

@fastify/middie vulnerable to middleware authentication bypass in child plugin scopes

Summary

@fastify/middie versions 9.3.1 and earlier do not register inherited middleware directly on child plugin engine instances. When a Fastify application registers authentication middleware in a parent scope and then registers child plugins with @fastify/middie, the child scope does not inherit the parent middleware. This allows unauthenticated requests to reach routes defined in child plugin scopes, bypassing authentication and authorization checks. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds.

Severity

9.1 (Critical)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-16 14:23 UTC

CWE

CWE-436 - Interpretation Conflict

Assigner

openjs redhat root

References

3 references

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

Impacted products

1 product

Vendor	Product	Version	CPE status
@fastify/middie	@fastify/middie	Affected: 0 , < 9.3.2 (semver) Unaffected: 9.3.2 (semver)	guessed

Credits

FredKSchott climba03003 UlisesGascon

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-6270

Vulnerability from fkie_nvd - Published: 2026-04-16 14:16 - Updated: 2026-06-17 11:00

Severity

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

Summary

References

URL	Tags
ce714d77-add3-4f53-aff5-83d477b104bb	https://cna.openjsf.org/security-advisories.html	Vendor Advisory
ce714d77-add3-4f53-aff5-83d477b104bb	https://github.com/fastify/fastify-express/security/advisories/GHSA-hrwm-hgmj-7p9c	Exploit, Mitigation, Vendor Advisory
ce714d77-add3-4f53-aff5-83d477b104bb	https://github.com/fastify/middie/security/advisories/GHSA-72c6-fx6q-fr5w	Vendor Advisory

Impacted products

	Vendor	Product	Version
	fastify	fastify\/middie	*

JSON

To clipboard

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GHSA-72C6-FX6Q-FR5W

Vulnerability from github – Published: 2026-04-16 22:29 – Updated: 2026-04-16 22:29

Summary

@fastify/middie vulnerable to middleware authentication bypass in child plugin scopes

Details

Impact

@fastify/middie v9.3.1 and earlier incorrectly re-prefixes middleware paths when propagating them to child plugin scopes. When a child plugin is registered with a prefix that overlaps with a parent-scoped middleware path, the middleware path is modified during inheritance and silently fails to match incoming requests.

This results in complete bypass of middleware security controls for all routes defined within affected child plugin scopes, including nested (grandchild) scopes. Authentication, authorization, rate limiting, and any other middleware-based security mechanisms are skipped. No special request crafting or configuration is required.

This is the same vulnerability class as GHSA-hrwm-hgmj-7p9c (CVE-2026-33807) in @fastify/express.

Patches

Upgrade to @fastify/middie v9.3.2 or later.

Workarounds

None. Upgrade to the patched version.

Severity

9.1 (Critical)


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

Show details on source website

JSON

To clipboard

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        }
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    "github_reviewed": true,
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    "nvd_published_at": "2026-04-16T14:16:19Z",
    "severity": "CRITICAL"
  },
  "details": "### Impact\n\n`@fastify/middie` v9.3.1 and earlier incorrectly re-prefixes middleware paths when propagating them to child plugin scopes. When a child plugin is registered with a prefix that overlaps with a parent-scoped middleware path, the middleware path is modified during inheritance and silently fails to match incoming requests.\n\nThis results in complete bypass of middleware security controls for all routes defined within affected child plugin scopes, including nested (grandchild) scopes. Authentication, authorization, rate limiting, and any other middleware-based security mechanisms are skipped. No special request crafting or configuration is required.\n\nThis is the same vulnerability class as [GHSA-hrwm-hgmj-7p9c](https://github.com/fastify/fastify-express/security/advisories/GHSA-hrwm-hgmj-7p9c) (CVE-2026-33807) in `@fastify/express`.\n\n### Patches\n\nUpgrade to `@fastify/middie` v9.3.2 or later.\n\n### Workarounds\n\nNone. Upgrade to the patched version.",
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  "modified": "2026-04-16T22:29:04Z",
  "published": "2026-04-16T22:29:04Z",
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      "url": "https://github.com/fastify/fastify-express/security/advisories/GHSA-hrwm-hgmj-7p9c"
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      "type": "CVSS_V3"
    }
  ],
  "summary": "@fastify/middie vulnerable to middleware authentication bypass in child plugin scopes"
}

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.

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

CVE-2026-6270 (GCVE-0-2026-6270)

FKIE_CVE-2026-6270

GHSA-72C6-FX6Q-FR5W

Impact

Patches

Workarounds

Tags

Sightings

Nomenclature

Related by attack behaviour