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CVE-2026-6270

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CVE-2026-6270

Published: Apr 16, 2026

Modified: Apr 16, 2026

PUBLISHED

CVSS v3.1

9.1

CRITICAL

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.

VendorProductVersions

@fastify/middie

@fastify/middie

affected
0 - < 9.3.2
unaffected
9.3.2

Weaknesses (CWE)

CWE-436

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

References

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