---
cve: "CVE-2026-59897"
severity: "MEDIUM"
cvss: 4.8
epss: "13%"
vendor: "honojs"
kev: false
exploited: false
published: "2026-07-08 17:17:27"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-15T09:26:51+02:00"
---

# CVE-2026-59897

> 4.8 MEDIUM · 🧪 PoC

## Beschreibung

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.3.3 before 4.12.27, the AWS API Gateway v1 adapter can drop a distinct repeated request header value because it de-duplicates values using a substring comparison instead of an exact match, so middleware or application logic that depends on the complete X-Forwarded-For chain, rate limiting, audit logging, or proxy-chain validation can receive incomplete data. This issue is fixed in version 4.12.27.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/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 | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 97c6fe1f12298c715eb7b2da65b4b6e0d81682bb (Commit)
- aa921770d09bc35970362d5a2630a878f6d982fd (Commit)

## Referenzen

- <https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc>
- <https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd>
- <https://github.com/honojs/hono/releases/tag/v4.12.27>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-59897) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_