What is CVE-2026-39407?

CVE-2026-39407 is a medium-severity vulnerability in Honojs Hono, classified under Path Traversal. CVSS score: 5.3/10. Published 2026-04-08.

How severe is CVE-2026-39407?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Path Traversal in Honojs Hono

CVE-2026-39407

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…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.000 (6.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Honojs Hono — versions < 4.12.12

Weakness classification (CWE)

CWE-22 — Path Traversal

References

https://github.com/honojs/hono/security/advisories/GHSA-wmmm-f939-6g9c (x_refsource_CONFIRM)
https://github.com/honojs/hono/commit/9aff14bd727f8b0435c963363fd803260e7b8e3c (x_refsource_MISC)
https://github.com/honojs/hono/releases/tag/v4.12.12 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-39407?: CVE-2026-39407 is a medium-severity vulnerability in Honojs Hono, classified under Path Traversal. CVSS score: 5.3/10. Published 2026-04-08.
How severe is CVE-2026-39407?: Medium severity. CVSS v3 base score is 5.3 out of 10.