CVE-2026-6270

CRITICAL

9.1

Description

@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.

Details CVE

Score CVSS v3.19.1

SeveriteCRITICAL

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

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurNONE

Publie4/16/2026

Derniere modification4/17/2026

Sourcenvd

Observations honeypot0

Faiblesses (CWE)

CWE-436

References

https://cna.openjsf.org/security-advisories.html(ce714d77-add3-4f53-aff5-83d477b104bb)

https://github.com/fastify/fastify-express/security/advisories/GHSA-hrwm-hgmj-7p9c(ce714d77-add3-4f53-aff5-83d477b104bb)

https://github.com/fastify/middie/security/advisories/GHSA-72c6-fx6q-fr5w(ce714d77-add3-4f53-aff5-83d477b104bb)

Correlations IOC

Aucune correlation enregistree

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