---
cve: "CVE-2026-39409"
severity: "MEDIUM"
cvss: 6.3
epss: "34%"
vendor: "honojs"
kev: false
exploited: false
published: "2026-04-08 15:16:14"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T16:37:57+02:00"
---

# CVE-2026-39409

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, ipRestriction() does not canonicalize IPv4-mapped IPv6 client addresses (e.g. ::ffff:127.0.0.1) before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause IPv4 rules to fail to match, leading to unintended authorization behavior. This vulnerability is fixed in 4.12.12.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 48fa2233bc092f650119f42df043050737cabf39 (Commit)
- c37ba26da9709ad03b803d1972773ed864b7e60d (Commit)

## Referenzen

- <https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g>
- <https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39>
- <https://github.com/honojs/hono/releases/tag/v4.12.12>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-39409) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_