{"id":"CVE-2026-6414","aliases":["GHSA-x428-ghpx-8j92"],"url":"https://o3.security/vulnerability/CVE-2026-6414","summary":"@fastify/static vulnerable to route guard bypass via encoded path separators","details":"@fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem resolution, while Fastify's router treats them as literal characters. This mismatch allows attackers to bypass route-based middleware or guards that protect files served by @fastify/static. For example, a route guard on a protected path can be circumvented by encoding the path separator in the URL. Upgrade to @fastify/static 9.1.1 to fix this issue. There are no workarounds.","published":"2026-04-16T13:09:03.526Z","modified":"2026-07-15T01:48:58.776188853Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@fastify/static","fixedVersion":"9.1.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6414.json"},{"type":"ADVISORY","url":"https://github.com/fastify/fastify-static/security/advisories/GHSA-x428-ghpx-8j92"},{"type":"ADVISORY","url":"https://github.com/fastify/middie/security/advisories/GHSA-cxrg-g7r8-w69p"},{"type":"ADVISORY","url":"https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6414"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:48:58.776188853Z"}}