{"id":"GHSA-frvp-7c67-39w9","revision":null,"records":[{"revision":"cf5a73a2c18e439d94eeb7daed918654","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-frvp-7c67-39w9","aliases":[],"title":"Node.js Adapter for Hono: Path traversal in `serve-static` on Windows via encoded backslash (`%5C`)","description":"The same as the `hono` core [Path traversal in `serve-static` on Windows via encoded backslash (`%5C`)](https://github.com/honojs/hono/security/advisories/GHSA-wwfh-h76j-fc44).\n\n### Summary\n\nOn Windows hosts, an encoded backslash (`%5C`) in the request path decodes to `\\`, which the Windows path resolver treats as a separator. `serve-static` then resolves a single URL segment such as `admin\\secret.txt` into a nested file under the root and serves it, letting an attacker read static files meant to be protected behind prefix-mounted middleware. Directory escape (`..`) remains blocked.\n\n### Details\n\nThe router splits paths only on `/`, so `/admin%5Csecret.txt` is one segment and middleware on `/admin/*` does not run. The `serve-static` guard rejects `.`/`..` and consecutive separators but lets a lone `\\` through; on Windows the file resolver re-splits it into the protected subtree.\n\nThis affects Windows hosts serving static files via the Node, Bun, or Deno adapters that guard a static subtree with prefix-mounted middleware.\n\n### Impact\n\nAn unauthenticated attacker can read static files under a middleware-guarded prefix on Windows hosts. The read stays within the configured root; escape outside the root is not possible.","state":0,"publishedAt":"2026-07-21T18:17:25+00:00","modifiedAt":"2026-09-10T03:50:51.9452772+00:00","affected":[{"ecosystem":"npm","name":"@hono/node-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.0.0"},{"kind":"fixed","version":"2.0.5"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@hono/node-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.19.15"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/honojs/node-server/security/advisories/GHSA-frvp-7c67-39w9","https://github.com/honojs/node-server/commit/cd076e117cfe4cb8d31f9eb11d2e8f38a6cb8faf","https://github.com/honojs/node-server","https://github.com/honojs/node-server/releases/tag/v2.0.5"],"sourceUrl":"https://github.com/advisories/GHSA-frvp-7c67-39w9","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-frvp-7c67-39w9","identifiers":["GHSA-frvp-7c67-39w9"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-f981543109394c8f9b3df5737aa835e7","complete":false,"records":13821,"lastAttemptAt":"2026-11-15T11:15:00.6236179+00:00","lastSuccessAt":"2026-11-15T11:15:00.619+00:00","error":"257 identifier lookups failed; latest failures include AccessDenied (HTTP 403). Other identifiers were checked independently.","lastVerifiedAt":"2026-11-15T11:15:00.619+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13558,"expectedIdentifiers":13874,"failedIdentifiers":257},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-15T11:05:17.2943378+00:00","complete":true,"records":1125,"lastAttemptAt":"2026-11-15T11:05:17.2943378+00:00","lastSuccessAt":"2026-11-15T11:05:17.4693563+00:00","error":null,"lastVerifiedAt":"2026-11-15T11:05:17.4693566+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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