@fastify/static vulnerable to Authorization Bypass via Non-Canonical URL Paths
### Impact `@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. ### Patches Upgrade to `@fastify/static` >= 10.1.2. ### Workarounds None. Upgrade to the patched version.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-7120US | — | — | ||
@fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate path separators in the pathname used for file resolution. Versions up to and includ… | ||||
references
External citations — patches, advisories, analysis.
- https://cna.openjsf.org/security-advisories.htmlWEB
- https://github.com/fastify/fastify-staticPACKAGE
- https://github.com/fastify/fastify-static/commit/878c72e920fabacf7e37739bf78057044717bf63WEB
- https://github.com/fastify/fastify-static/releases/tag/v10.1.2WEB
- https://github.com/fastify/fastify-static/security/advisories/GHSA-8pvw-jcv7-9cmjWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-7120ADVISORY
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