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CVE-2026-6270

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

Description (CNA)

@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.

Affected (CNA)

Vendor / productVersions
@fastify/middie / @fastify/middieaffected 0 before 9.3.2; unaffected 9.3.2

CWE

CWE-436

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.