CVE-2026-29045

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/4/2026

Last Modified3/6/2026

Sourcenvd

Honeypot Sightings0

Affected Products

hono:hono

Weaknesses (CWE)

CWE-177

References

https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3(security-advisories@github.com)

https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr(security-advisories@github.com)

IOC Correlations

No correlations recorded

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