# CVE-2026-29045

## Summary

- **CVE ID:** CVE-2026-29045
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
- **CWE:** CWE-177
- **Published:** Mar 4, 2026
- **Last Modified:** Mar 12, 2026

## 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.

## Affected Products

- honojs — hono (< 4.12.4)

## References

- [CNA](https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr)
- [CNA](https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.50%
- **EPSS Percentile:** 41.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._