CVE-2026-29045 json
Hono: Arbitrary file access via serveStatic vulnerability
published 2026-03-04 8 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-9506 , GHSA-q5qw-h33p-qvwr
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 48%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 8 mo ago
Exploit prediction
0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | hono | <4.12.4 |
4.12.4 |
Affected products
- honojs hono
Classification
- Weakness
-
- CWE-177 Improper Handling of URL Encoding (Hex Encoding)
References
-
github.com
/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3
web, patch
-
github.com
/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-29045
advisory
-
github.com
/honojs/hono
package
Sources
- CVE List CVE-2026-29045
- GitHub Advisory GHSA-q5qw-h33p-qvwr
- NVD CVE-2026-29045
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.