CVE-2026-29087: @hono/node server @hono/node-server Has Authorization Bypass For Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-wc8c-qw6v-h7f6",
  "modified" : "2026-03-06T22:43:58Z",
  "published" : "2026-03-04T20:05:49Z",
  "aliases" : [ "CVE-2026-29087" ],
  "summary" : "@hono/node-server has authorization bypass for protected static paths via encoded slashes in Serve Static Middleware",
  "details" : "## Summary\n\nWhen using @hono/node-server's static file serving together with route-based middleware protections (e.g. protecting `/admin/*`), inconsistent URL decoding can allow protected static resources to be accessed without authorization.\n\nIn particular, paths containing encoded slashes (`%2F`) may be evaluated differently by routing/middleware matching versus static file path resolution, enabling a bypass where middleware does not run but the static file is still served.\n\n## Details\n\nThe routing layer and the node-server static handler normalize request paths differently. The router preserves `%2F` as a literal string when matching routes, while the static handler decodes `%2F` into `/` before resolving the filesystem path.\n\nExample request:\n\n- `/admin%2Fsecret.html`\n\nThis may:\n- fail to match middleware intended for `/admin/*`, but\n- still be resolved by the static handler as `/admin/secret.html` under the configured static root.\n\nThis does not allow access outside the configured static root and is not a path traversal vulnerability.\n\n## Impact\n\nAn unauthenticated attacker could bypass route-based authorization protections for protected static resources by supplying paths containing encoded slashes.\n\nApplications relying solely on route-based middleware to protect static subpaths under the same static root may have exposed those resources.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@hono/node-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.19.10"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/honojs/node-server/security/advisories/GHSA-wc8c-qw6v-h7f6"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-29087"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/honojs/node-server/commit/455015be1697dd89974a68b70350ea7b2d126d2e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/honojs/node-server"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-04T20:05:49Z",
    "nvd_published_at" : "2026-03-06T18:16:19Z"
  }
}