---
cve: "CVE-2026-29085"
severity: "MEDIUM"
cvss: 6.5
epss: "24%"
vendor: "honojs"
kev: false
exploited: false
published: "2026-03-04 23:16:10"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T09:45:08+02:00"
---

# CVE-2026-29085

> 6.5 MEDIUM · 🧪 PoC

## Beschreibung

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using streamSSE() in Streaming Helper, the event, id, and retry fields were not validated for carriage return (\r) or newline (\n) characters. Because the SSE protocol uses line breaks as field delimiters, this could allow injection of additional SSE fields within the same event frame if untrusted input was passed into these fields. This issue has been patched in version 4.12.4.

## CVSS-Vektor

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

## Patch verfügbar (OSV)

- 19d20d23a2921e26c3bbfdb5549fce98b4a39b28 (Commit)
- f4123ed9ea3c7c52380cc99a079a4d773838846e (Commit)

## Referenzen

- <https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr>
- <https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-29085) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_