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.
Metrics
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References
History
Fri, 27 Feb 2026 19:15:00 +0000
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ssvc
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Fri, 27 Feb 2026 18:45:00 +0000
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| Description | 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. | |
| Title | @fastify/middie has an improper path normalization vulnerability | |
| Weaknesses | CWE-20 | |
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cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: openjs
Published:
Updated: 2026-02-27T18:56:02.979Z
Reserved: 2026-02-20T16:50:56.850Z
Link: CVE-2026-2880
Vulnrichment
Updated: 2026-02-27T18:55:51.355Z
NVD
Status : Received
Published: 2026-02-27T19:16:12.807
Modified: 2026-02-27T19:16:12.807
Link: CVE-2026-2880
Redhat
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OpenCVE Enrichment
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