---
cve: "CVE-2026-42586"
severity: "MEDIUM"
cvss: 6.8
epss: "20%"
vendor: "io.netty"
kev: false
exploited: false
published: "2026-05-13 19:17:24"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T18:11:47+02:00"
---

# CVE-2026-42586

> 6.8 MEDIUM · 🧪 PoC

## Beschreibung

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, the Netty Redis codec encoder (RedisEncoder) writes user-controlled string content directly to the network output buffer without validating or sanitizing CRLF (\r\n) characters. Since the Redis Serialization Protocol (RESP) uses CRLF as the command/response delimiter, an attacker who can control the content of a Redis message can inject arbitrary Redis commands or forge fake responses. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- fb13125f135ab53203513ff603872a3abe84d38d (Commit)
- b3844c8108b42f68d56144b36d4d1ed96078a688 (Commit)

## Referenzen

- <https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-42586) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_