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
Affected Vendors & Products
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-8p85-9qpw-fwgw | @fastify/middie has Improper Path Normalization when Using Path-Scoped Middleware |
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Thu, 19 Mar 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Openjsf
Openjsf \@fastify\/middie |
|
| CPEs | cpe:2.3:a:openjsf:\@fastify\/middie:*:*:*:*:*:fastify:*:* | |
| Vendors & Products |
Openjsf
Openjsf \@fastify\/middie |
|
| Metrics |
cvssV3_1
|
Mon, 02 Mar 2026 12:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Fastify
Fastify middie |
|
| Vendors & Products |
Fastify
Fastify middie |
Fri, 27 Feb 2026 19:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Fri, 27 Feb 2026 18:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 | |
| References |
| |
| Metrics |
cvssV4_0
|
Projects
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Status: PUBLISHED
Assigner: openjs
Published:
Updated: 2026-02-27T18:56:02.979Z
Reserved: 2026-02-20T16:50:56.850Z
Link: CVE-2026-2880
Updated: 2026-02-27T18:55:51.355Z
Status : Analyzed
Published: 2026-02-27T19:16:12.807
Modified: 2026-03-19T17:30:15.520
Link: CVE-2026-2880
No data.
OpenCVE Enrichment
Updated: 2026-03-02T12:05:14Z
Github GHSA