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CVE-2026-39407

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:fb7706fe39ed514ac2464a78d0e6fb17ec61bea26cab0dd082c3c6ca17195721
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"hono","vendor":"honojs","versions":[{"status":"affected","version":"< 4.12.12"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:31a150987e3ff702ef757e1ca9378e029fa2eae197f688fa5f8b5d799743f623 · sha256:d820e40632075baf… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:31a150987e3ff702ef757e1ca9378e029fa2eae197f688fa5f8b5d799743f623 · sha256:d820e40632075baf… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:31a150987e3ff702ef757e1ca9378e029fa2eae197f688fa5f8b5d799743f623 · sha256:d820e40632075baf… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/honojs/hono/commit/9aff14bd727f8b0435c963363fd803260e7b8e3c","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/commit/9aff14bd727f8b0435c963363fd803260e7b8e3c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:31a150987e3ff702ef757e1ca9378e029fa2eae197f688fa5f8b5d799743f623 · sha256:d820e40632075baf… · /containers/cna/references/1
{"name":"https://github.com/honojs/hono/releases/tag/v4.12.12","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/releases/tag/v4.12.12"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:31a150987e3ff702ef757e1ca9378e029fa2eae197f688fa5f8b5d799743f623 · sha256:d820e40632075baf… · /containers/cna/references/2
{"name":"https://github.com/honojs/hono/security/advisories/GHSA-wmmm-f939-6g9c","tags":["x_refsource_CONFIRM"],"url":"https://github.com/honojs/hono/security/advisories/GHSA-wmmm-f939-6g9c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:31a150987e3ff702ef757e1ca9378e029fa2eae197f688fa5f8b5d799743f623 · sha256:d820e40632075baf… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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