{"id":"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.","aliases":["GHSA-x428-ghpx-8j92"],"modified":"2026-07-08T08:14:40.405176892Z","published":"2026-04-16T13:09:03.526Z","related":["GHSA-cxrg-g7r8-w69p","GHSA-q5qw-h33p-qvwr","GHSA-x428-ghpx-8j92"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6414.json","cna_assigner":"openjs","cwe_ids":["CWE-177"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/fastify/fastify-static","events":[{"introduced":"85a80f11f76a0f49d7186c8e512daedcafe21153"},{"fixed":"48b136f5d8da0efea328f49f6202ab3edabf608b"}],"database_specific":{"source":["AFFECTED_FIELD","CPE_RANGE"],"extracted_events":[{"introduced":"8.0.0"},{"fixed":"9.1.1"}],"cpe":"cpe:2.3:a:fastify:fastify-static:*:*:*:*:*:*:*:*"}}],"versions":["v9.1.0","v9.0.0","v8.3.0","v8.2.0","v8.1.1","v8.1.0","v8.0.4","v8.0.3","v8.0.2","v8.0.1","v8.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6414.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}