Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hono | Hono | < 4.12.4 |
Related Weaknesses (CWE)
References
- https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3Patch
- https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwrVendor Advisory
FAQ
What is CVE-2026-29045?
CVE-2026-29045 is a vulnerability with a CVSS score of 7.5 (HIGH). 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('/a...
How severe is CVE-2026-29045?
CVE-2026-29045 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-29045?
Check the references section above for vendor advisories and patch information. Affected products include: Hono Hono.