CVE-2026-14198 Detail
Received
This CVE record has recently been published to the CVE List and has been included within the NVD dataset. Description@fastify/middie versions 9.1.0 through 9.3.2 decode the encoded slash %2F inside path parameter values before matching middleware paths, while Fastify's underlying router preserves the encoding during route lookup. The two layers disagree on the canonical request path, so the middleware fails to match a URL that the route handler does match. When middleware is used for authentication, authorization, rate limiting, or auditing on parameterized paths, an attacker can reach the protected handler by sending a single crafted URL with an encoded slash in the parameter position. The bypass is HTTP method agnostic and requires no authentication or special preconditions. Patches: upgrade to @fastify/middie 9.3.3. Workarounds: avoid parameterized middleware paths for security decisions, or enforce authentication at the route handler or via a Fastify hook that runs after the router has resolved the request. Metrics
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Weakness Enumeration
Quick InfoCVE Dictionary Entry:CVE-2026-14198 NVD Published Date: 07/01/2026 NVD Last Modified: 07/01/2026 Source: openjs |
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