CVE-2026-54286 | Hono is a Web application framework that provides support fo… | CVSS 5.9 MEDIUM

Description

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. serve-static then resolves a single URL segment such as admin\secret.txt into a nested file under the root and serves it, letting an attacker read static files meant to be protected behind prefix-mounted middleware. This vulnerability is fixed in 4.12.25.

Metadata

CVE ID: CVE-2026-54286
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-12 17:46 UTC
Published: 2026-06-22 17:14 UTC
Last updated: 2026-06-22 17:14 UTC
Primary CWE: CWE-22
CWE-22: Improper Limitation of a Pathname to a Restricted Di…
Vendor / Product: honojs / hono
Sources: cve.org · NVD

Severity & Metrics

5.9 MEDIUM CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
honojs	hono	—	< 4.12.25

Weakness (CWE)

CWE	Source	Description
CWE-22	cna	CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS scores (1)

Score	Severity	Version	Source	Vector
5.9	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References (1)

https://github.com/honojs/hono/security/advisories/GHSA-wwfh-h76j-fc44 https://github.com/honojs/hono/security/advisories/GHSA-wwfh-h76j-fc44