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3 vulnerabilities found for by @fastify/middie

CVE-2026-33804 (GCVE-0-2026-33804)
Vulnerability from cvelistv5
Published
2026-04-16 13:56
Modified
2026-04-16 14:41
Severity ?
7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-436 - Interpretation Conflict
Summary
@fastify/middie versions 9.3.1 and earlier are vulnerable to middleware bypass when the deprecated Fastify ignoreDuplicateSlashes option is enabled. The middleware path matching logic does not account for duplicate slash normalization performed by Fastify's router, allowing requests with duplicate slashes to bypass middleware authentication and authorization checks. This only affects applications using the deprecated ignoreDuplicateSlashes option. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds other than disabling the ignoreDuplicateSlashes option.
References
Impacted products
Vendor Product Version
@fastify/middie @fastify/middie Version: 0   ≤
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CVE-2026-6270 (GCVE-0-2026-6270)
Vulnerability from cvelistv5
Published
2026-04-16 13:44
Modified
2026-04-16 14:24
Severity ?
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-436 - Interpretation Conflict
Summary
@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
Impacted products
Vendor Product Version
@fastify/middie @fastify/middie Version: 0   ≤
Create a notification for this product.
Show details on NVD website

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CVE-2026-2880 (GCVE-0-2026-2880)
Vulnerability from cvelistv5
Published
2026-02-27 18:25
Modified
2026-02-27 18:56
Severity ?
8.2 (High) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
Summary
A vulnerability in @fastify/middie versions < 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)). When Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.
References
Impacted products
Vendor Product Version
@fastify/middie @fastify/middie Version: 0.0.0   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

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