{"id":"CVE-2026-39407","aliases":["GHSA-wmmm-f939-6g9c"],"url":"https://o3.security/vulnerability/CVE-2026-39407","summary":"Hono has a middleware bypass via repeated slashes in serveStatic","details":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path handling inconsistency in serveStatic allows protected static files to be accessed by using repeated slashes (//) in the request path. When route-based middleware (e.g., /admin/*) is used for authorization, the router may not match paths containing repeated slashes, while serveStatic resolves them as normalized paths. This can lead to a middleware bypass. This vulnerability is fixed in 4.12.12.","published":"2026-04-08T14:41:20.301Z","modified":"2026-08-07T11:50:15.298628596Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"hono","fixedVersion":"4.12.12"}],"fix":{"url":"https://github.com/honojs/hono/commit/9aff14bd727f8b0435c963363fd803260e7b8e3c","label":"honojs/hono@9aff14b"},"references":[{"type":"WEB","url":"https://github.com/honojs/hono/releases/tag/v4.12.12"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39407.json"},{"type":"ADVISORY","url":"https://github.com/honojs/hono/security/advisories/GHSA-wmmm-f939-6g9c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39407"},{"type":"FIX","url":"https://github.com/honojs/hono/commit/9aff14bd727f8b0435c963363fd803260e7b8e3c"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:50:15.298628596Z"}}