Incorrect Behavior Order: Validate Before Canonicalize Affecting @fastify/static package, versions <10.1.2
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.
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Test your applications- Snyk IDSNYK-JS-FASTIFYSTATIC-18233800
- published23 Jul 2026
- disclosed23 Jul 2026
- credityuki-matsuhashi
Introduced: 23 Jul 2026
NewCVE-2026-7120 (opens in a new tab)How to fix?
Upgrade @fastify/static to version 10.1.2 or higher.
Overview
@fastify/static is a Plugin for serving static files as fast as possible.
Affected versions of this package are vulnerable to Incorrect Behavior Order: Validate Before Canonicalize via non-canonical URL path handling in the allowedPath check in index.js. An attacker can bypass file/subtree restrictions by sending paths such as //file, /./file, or /public/../private/file that allowedPath evaluates before pathname normalization. Applications that rely on allowedPath to block specific static files or deny access outside an allowed subtree can serve files that should have been rejected, exposing protected content to unauthorized clients.