{"id":"EUVD-2026-38327","revision":null,"records":[{"revision":"a5e5a461e1a14fefb16e8b300efbbb41","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-54286","aliases":[],"title":"Hono: Path traversal in `serve-static` on Windows via encoded backslash (`%5C`)","description":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on 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. 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Prior to 4.12.25, on Windows hosts, an encoded backslash (%5C) in the request path decodes to \\, which the Windows path resolver treats as a separator. se…","description":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on 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. This vulnerability is fixed in 4.12.25.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9,"severity":null}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-wwfh-h76j-fc44"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-38327","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 22, 2026, 5:14:40 PM","dateUpdated":"Jun 23, 2026, 2:07:34 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-38327","identifiers":["EUVD-2026-38327","CVE-2026-54286","GHSA-wwfh-h76j-fc44"]},"retained":false,"historicalAffected":[]},{"revision":"853849e8a5044ba296c974e8039ab6e3","observedAt":"2026-10-27T14:13:32.924+00:00","statement":{"source":"nvd","id":"CVE-2026-54286","aliases":[],"title":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on Windows hosts, an encoded backslash (%5C) in the request path decodes to \\, which the Windows path resolver treats as a separator. se…","description":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on 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. This vulnerability is fixed in 4.12.25.","state":0,"publishedAt":"2026-06-22T18:16:47.213+00:00","modifiedAt":"2026-10-25T23:10:00.167+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-wwfh-h76j-fc44"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-54286","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-22"],"productCriteria":[],"sourceDates":{"published":"2026-06-22T18:16:47.213","lastModified":"2026-10-25T23:10:00.167"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-54286","identifiers":["CVE-2026-54286"]},"retained":false,"historicalAffected":[]},{"revision":"1feccc3f67fe48d39a48fc5bef04df7c","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-wwfh-h76j-fc44","aliases":["CVE-2026-54286"],"title":"hono: Path traversal in `serve-static` on Windows via encoded backslash (`%5C`)","description":"### 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":"2026-06-16T14:09:03+00:00","modifiedAt":"2026-09-10T03:50:51.0499205+00:00","affected":[{"ecosystem":"npm","name":"hono","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.12.25"}]}],"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/hono/security/advisories/GHSA-wwfh-h76j-fc44","https://nvd.nist.gov/vuln/detail/CVE-2026-54286","https://github.com/honojs/hono"],"sourceUrl":"https://github.com/advisories/GHSA-wwfh-h76j-fc44","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-wwfh-h76j-fc44","identifiers":["GHSA-wwfh-h76j-fc44","CVE-2026-54286"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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