CVE-2026-29045
Hono: Arbitrary file access via serveStatic vulnerability
- State
- Published
- Severity
- 7.5 High
- Published
- Mar 4, 2026
- Updated
- Mar 5, 2026
- Reserved
- Mar 3, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | GitHub_M |
Weaknesses
- CWE-177 Improper Handling of URL Encoding (Hex Encoding)
Affected Products
| Product | Versions |
|---|---|
honohonojs |
|
References
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