Vulnerability details
CVE-2026-29045
honojs hono
Hono: Arbitrary file access via serveStatic vulnerability
CVSS 3.1
7.5High
Official description
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 to the intended filesystem path. This issue has been patched in version 4.12.4.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| honojs | hono | < 4.12.4 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr x_refsource_CONFIRM
- https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3 x_refsource_MISC
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Details
- Published
- 2026-03-05
- Last updated
- 2026-03-05
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.58%
Probability of exploitation in 30 days
48.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-177Improper Handling of URL Encoding (Hex Encoding)