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CVE-2026-14198 is an authorization bypass vulnerability in @fastify/middie affecting versions 9.1.0 through 9.3.2. The flaw arises because @fastify/middie decodes encoded slashes (%2F) inside path parameter values before performing middleware path matching, while Fastify's underlying router preserves the encoded slash during route lookup. This creates a path canonicalization mismatch between the middleware layer and the router. As a result, middleware attached to parameterized paths may fail to match a crafted request URL even though the corresponding route handler still matches and executes. In deployments where middleware on parameterized paths is relied upon for authentication, authorization, rate limiting, or auditing, an attacker can send a crafted URL containing an encoded slash in the parameter position to bypass those middleware-enforced controls and reach the protected handler.
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