CVE-2026-2880
@fastify/middie has an improper path normalization vulnerability
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-20 |
| Vendor | @fastify/middie |
| Product | @fastify/middie |
| Published | Feb 27, 2026 |
| Last Updated | Feb 27, 2026 |
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Affected Versions
@fastify/middie / @fastify/middie
0.0.0 < 9.2.0