What is CVE-2026-54286?

CVE-2026-54286 is a medium-severity vulnerability in Honojs Hono, classified under Path Traversal. CVSS score: 5.9/10. Published 2026-06-22.

How severe is CVE-2026-54286?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Path Traversal in Honojs Hono

CVE-2026-54286

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on Windows hosts, an encoded backslash (%5C) in the request path decodes to \, which the Windows path resolver treats as a separator. s…

Vulnerability class: Path Traversal (Directory Traversal)

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Honojs Hono — versions < 4.12.25

Weakness classification (CWE)

CWE-22 — Path Traversal

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-54286?: CVE-2026-54286 is a medium-severity vulnerability in Honojs Hono, classified under Path Traversal. CVSS score: 5.9/10. Published 2026-06-22.
How severe is CVE-2026-54286?: Medium severity. CVSS v3 base score is 5.9 out of 10.