---
cve: "CVE-2026-27700"
severity: "HIGH"
cvss: 8.2
epss: "24%"
vendor: "honojs"
kev: false
exploited: false
published: "2026-02-25 16:23:26"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T12:23:10+02:00"
---

# CVE-2026-27700

> 8.2 HIGH · 🧪 PoC

## Beschreibung

Hono is a Web application framework that provides support for any JavaScript runtime. In versions 4.12.0 and 4.12.1, when using the AWS Lambda adapter (`hono/aws-lambda`) behind an Application Load Balancer (ALB), the `getConnInfo()` function incorrectly selected the first value from the `X-Forwarded-For` header. Because AWS ALB appends the real client IP address to the end of the `X-Forwarded-For` header, the first value can be attacker-controlled. This could allow IP-based access control mechanisms (such as the `ipRestriction` middleware) to be bypassed. Version 4.12.2 patches the issue.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- df97e5f49771a2a219770515859b9cc1d80abab0 (Commit)
- 41adbf56e252c04611f8972364ac0887ae07a4c7 (Commit)

## Referenzen

- <https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3>
- <https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7>
- <https://github.com/honojs/hono/releases/tag/v4.12.2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-27700) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_