@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.
References
| Link | Resource |
|---|---|
| https://cna.openjsf.org/security-advisories.html | Vendor Advisory |
| https://github.com/fastify/fastify-express/security/advisories/GHSA-hrwm-hgmj-7p9c | Exploit Mitigation Vendor Advisory |
| https://github.com/fastify/middie/security/advisories/GHSA-72c6-fx6q-fr5w | Vendor Advisory |
Configurations
History
22 Apr 2026, 17:31
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Openjsf \@fastify\/middie
Openjsf |
|
| CPE | cpe:2.3:a:openjsf:\@fastify\/middie:*:*:*:*:*:fastify:*:* | |
| References | () https://cna.openjsf.org/security-advisories.html - Vendor Advisory | |
| References | () https://github.com/fastify/fastify-express/security/advisories/GHSA-hrwm-hgmj-7p9c - Exploit, Mitigation, Vendor Advisory | |
| References | () https://github.com/fastify/middie/security/advisories/GHSA-72c6-fx6q-fr5w - Vendor Advisory |
16 Apr 2026, 14:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-16 14:16
Updated : 2026-04-22 17:31
NVD link : CVE-2026-6270
Mitre link : CVE-2026-6270
CVE.ORG link : CVE-2026-6270
JSON object : View
Products Affected
openjsf
- \@fastify\/middie
CWE
CWE-436
Interpretation Conflict