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CVE-2026-29045

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using serveStatic together with route-based middleware protections (e.g. app.use('/admin/*', ...)), inconsistent URL decoding allowed protected static resources to be accessed without authorization. The router used decodeURI, while serveStatic used decodeURIComponent. This mismatch allowed paths containing encoded slashes (%2F) to bypass middleware protections while still resolving
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:25f42c597657403c0da2df2f4d67fe48a685c4fd24755121ca7c1f89c07ce168
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":"< 4.12.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c3659ddfefdd27d608ca230a8e487fc469509b1e8474007f34669e62c98bbf88 · sha256:56ba88196346bdd8… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c3659ddfefdd27d608ca230a8e487fc469509b1e8474007f34669e62c98bbf88 · sha256:56ba88196346bdd8… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-177","description":"CWE-177: Improper Handling of URL Encoding (Hex Encoding)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c3659ddfefdd27d608ca230a8e487fc469509b1e8474007f34669e62c98bbf88 · sha256:56ba88196346bdd8… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c3659ddfefdd27d608ca230a8e487fc469509b1e8474007f34669e62c98bbf88 · sha256:56ba88196346bdd8… · /containers/cna/references/1
{"name":"https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c3659ddfefdd27d608ca230a8e487fc469509b1e8474007f34669e62c98bbf88 · sha256:56ba88196346bdd8… · /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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