| Package | Affected versions | Patched versions |
|---|---|---|
| fastify-static | < 10.1.1 | 10.1.1 |
| @fastify/static | < 10.1.1 | 10.1.1 |
@fastify/static is vulnerable to a bypass of route-based middleware and guards via non-leading .. and %2E%2E path segments. find-my-way does not normalize .. when matching routes, so a request such as /foo/../deep/secret.txt matches the static plugin's catch-all instead of the guarded /deep/*. The getPathnameForSend helper introduced by the fix for GHSA-x428-ghpx-8j92 only guards against the %2F variant; .. and %2E%2E survive the decodeURI + encodeURI round-trip and are then collapsed away by @fastify/send's path.normalize before its own traversal guard runs.
Applications that rely on route-based middleware or guards to protect files served by @fastify/static can be bypassed with non-leading dot-dot path segments.
Upgrade to @fastify/static 10.1.1.
Do not use route-based middlewares or guards to protect files served by @fastify/static.
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