---
cve: "CVE-2026-54286"
severity: "MEDIUM"
cvss: 5.9
epss: "43%"
vendor: "honojs"
kev: false
exploited: false
published: "2026-06-22 18:16:47"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T22:14:15+02:00"
---

# CVE-2026-54286

> 5.9 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- fce483e11466b72d27e61d44523c7e6edeb19e50 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-54286) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_