Interpretation Conflict Affecting @fastify/middie package, versions >=9.1.0 <9.3.4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JS-FASTIFYMIDDIE-19643570
- published8 Sept 2026
- disclosed4 Sept 2026
- creditElias Hasas
Introduced: 4 Sep 2026
NewCVE-2026-85184 (opens in a new tab)How to fix?
Upgrade @fastify/middie to version 9.3.4 or higher.
Overview
@fastify/middie is a Middleware engine for Fastify
Affected versions of this package are vulnerable to Interpretation Conflict via the request target evaluation. An attacker can gain unauthorized access to protected routes by crafting requests with absolute-form targets that bypass path-scoped middleware.