CVE-2026-7120: @fastify/static vulnerable to Authorization Bypass via Non-Canonical URL Paths
@fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate slashes in the pathname used for file resolution. Non-canonical pathnames such as //file, /./file, or /public/../private/file bypass allowedPath filtering while resolving to the intended file on disk.
Applications that use allowedPath as a security boundary to restrict access to specific static files or path subtrees may unintentionally expose files that were intended to be denied.
References
- cna.openjsf.org/security-advisories.html
- github.com/advisories/GHSA-8pvw-jcv7-9cmj
- github.com/fastify/fastify-static/commit/878c72e920fabacf7e37739bf78057044717bf63
- github.com/fastify/fastify-static/releases/tag/v10.1.2
- github.com/fastify/fastify-static/security/advisories/GHSA-8pvw-jcv7-9cmj
- nvd.nist.gov/vuln/detail/CVE-2026-7120
Code Behaviors & Features
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