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Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-6270

@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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.001

EPSS Ranking 24.6%

CVSS Severity

CVSS v3 Score 9.1

References

Products affected by CVE-2026-6270

Fastify » Fastify/middie » Version: 0.2.0

cpe:2.3:a:fastify:fastify/middie:0.2.0
Fastify » Fastify/middie » Version: 0.3.0

cpe:2.3:a:fastify:fastify/middie:0.3.0
Fastify » Fastify/middie » Version: 1.0.0

cpe:2.3:a:fastify:fastify/middie:1.0.0
Fastify » Fastify/middie » Version: 1.1.0

cpe:2.3:a:fastify:fastify/middie:1.1.0
Fastify » Fastify/middie » Version: 2.0.0

cpe:2.3:a:fastify:fastify/middie:2.0.0
Fastify » Fastify/middie » Version: 2.1.0

cpe:2.3:a:fastify:fastify/middie:2.1.0
Fastify » Fastify/middie » Version: 2.1.1

cpe:2.3:a:fastify:fastify/middie:2.1.1
Fastify » Fastify/middie » Version: 3.0.0

cpe:2.3:a:fastify:fastify/middie:3.0.0
Fastify » Fastify/middie » Version: 3.1.0

cpe:2.3:a:fastify:fastify/middie:3.1.0
Fastify » Fastify/middie » Version: 3.2.0

cpe:2.3:a:fastify:fastify/middie:3.2.0
Fastify » Fastify/middie » Version: 3.2.1

cpe:2.3:a:fastify:fastify/middie:3.2.1
Fastify » Fastify/middie » Version: 4.0.0

cpe:2.3:a:fastify:fastify/middie:4.0.0
Fastify » Fastify/middie » Version: 4.0.1

cpe:2.3:a:fastify:fastify/middie:4.0.1
Fastify » Fastify/middie » Version: 4.1.0

cpe:2.3:a:fastify:fastify/middie:4.1.0
Fastify » Fastify/middie » Version: 5.0.0

cpe:2.3:a:fastify:fastify/middie:5.0.0
Fastify » Fastify/middie » Version: 5.1.0

cpe:2.3:a:fastify:fastify/middie:5.1.0
Fastify » Fastify/middie » Version: 5.2.0

cpe:2.3:a:fastify:fastify/middie:5.2.0
Fastify » Fastify/middie » Version: 5.3.0

cpe:2.3:a:fastify:fastify/middie:5.3.0
Fastify » Fastify/middie » Version: 5.4.0

cpe:2.3:a:fastify:fastify/middie:5.4.0
Fastify » Fastify/middie » Version: 6.0.0

cpe:2.3:a:fastify:fastify/middie:6.0.0
Fastify » Fastify/middie » Version: 6.1.0

cpe:2.3:a:fastify:fastify/middie:6.1.0
Fastify » Fastify/middie » Version: 7.0.0

cpe:2.3:a:fastify:fastify/middie:7.0.0
Fastify » Fastify/middie » Version: 8.0.0

cpe:2.3:a:fastify:fastify/middie:8.0.0
Fastify » Fastify/middie » Version: 8.1.0

cpe:2.3:a:fastify:fastify/middie:8.1.0
Fastify » Fastify/middie » Version: 8.2.0

cpe:2.3:a:fastify:fastify/middie:8.2.0
Fastify » Fastify/middie » Version: 8.3.0

cpe:2.3:a:fastify:fastify/middie:8.3.0
Fastify » Fastify/middie » Version: 8.3.1

cpe:2.3:a:fastify:fastify/middie:8.3.1
Fastify » Fastify/middie » Version: 8.3.2

cpe:2.3:a:fastify:fastify/middie:8.3.2
Fastify » Fastify/middie » Version: 8.3.3

cpe:2.3:a:fastify:fastify/middie:8.3.3
Fastify » Fastify/middie » Version: 9.0.0

cpe:2.3:a:fastify:fastify/middie:9.0.0
Fastify » Fastify/middie » Version: 9.0.1

cpe:2.3:a:fastify:fastify/middie:9.0.1
Fastify » Fastify/middie » Version: 9.0.2

cpe:2.3:a:fastify:fastify/middie:9.0.2
Fastify » Fastify/middie » Version: 9.0.3

cpe:2.3:a:fastify:fastify/middie:9.0.3
Fastify » Fastify/middie » Version: 9.1.0

cpe:2.3:a:fastify:fastify/middie:9.1.0
Fastify » Fastify/middie » Version: 9.2.0

cpe:2.3:a:fastify:fastify/middie:9.2.0
Fastify » Fastify/middie » Version: 9.3.0

cpe:2.3:a:fastify:fastify/middie:9.3.0
Fastify » Fastify/middie » Version: 9.3.1

cpe:2.3:a:fastify:fastify/middie:9.3.1

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-6270

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