Medium 5.3Published Apr 8, 2026

CVE-2026-39407Hono has a middleware bypass via repeated slashes in serveStatic

Updated under an hour ago (Oct 28, 2026, 10:30 AM ET)

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Every CVE for honojs hono

Exploited in the last 30 days

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path handling inconsistency in serveStatic allows protected static files to be accessed by using repeated slashes (//) in the request path. When route-based middleware (e.g., /admin/*) is used for authorization, the router may not match paths containing repeated slashes, while serveStatic resolves them as normalized paths. This can lead to a middleware bypass. This vulnerability is fixed in 4.12.12.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

honojs hono honojs:hono (from the name)	before 4.12.12	CNA record
hono hono hono:hono	through 4.12.11	NVD

References

References

https://github.com/honojs/hono/security/advisories/GHSA-wmmm-f939-6g9c	x-refsource-confirm, vendor-advisory
https://github.com/honojs/hono/commit/9aff14bd727f8b0435c963363fd803260e7b8e3c	x-refsource-misc, patch
https://github.com/honojs/hono/releases/tag/v4.12.12	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.