Vulnerability advisory

GHSA-83w8-p2f5-377r

@fastify/static vulnerable to route guard bypass via path traversal

Published Jul 24, 2026Updated Jul 24, 2026OSV record ↗

Also known as CVE-2026-15074

Severity

CVSS 3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected versions

@fastify/static npm

All @fastify/static advisories →

Affected	Fixed in
All versions before 10.1.1	`10.1.1`Advisories →

Description

Impact

@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.

Patches

Upgrade to @fastify/static 10.1.1.

Workarounds

Do not use route-based middlewares or guards to protect files served by @fastify/static.