---
cve: "CVE-2026-50560"
severity: "MEDIUM"
cvss: 6.9
epss: "30%"
vendor: "netty"
kev: false
exploited: false
published: "2026-06-12 16:16:32"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-05T22:55:26+02:00"
---

# CVE-2026-50560

> 6.9 MEDIUM · 🧪 PoC

## Beschreibung

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty HTTP/2 max header size handling produces an attack similar to HTTP/2 Rapid Reset. There is a setting in the http2 specification called `SETTINGS_MAX_HEADER_LIST_SIZE`. When a client sends that setting to Netty, it appears that Netty will behave as follows: read the request; proxy the request to the origin; attempt to produce a response; and create an exception while writing the headers for the response. Functionally, this should be similar to the http2 reset attack, but with a different on-the-wire signature. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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)

- f05f765d81460799c53123a207f665bf3b465171 (Commit)
- a41f7b289ce1d697c50846f3ade3983e22b2ed40 (Commit)

## Referenzen

- <https://github.com/netty/netty/security/advisories/GHSA-563q-j3cm-6jxm>
- <https://github.com/netty/netty/releases/tag/netty-4.1.135.Final>
- <https://github.com/netty/netty/releases/tag/netty-4.2.15.Final>
- <https://www.rfc-editor.org/rfc/rfc9113.html#name-defined-settings>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-50560) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_