---
cve: "CVE-2026-56855"
severity: "HIGH"
cvss: 7.5
epss: "28.6%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-09-02 20:17:36"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T18:10:12+02:00"
---

# CVE-2026-56855

> 7.5 HIGH

## Beschreibung

Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.

## CVSS-Vektor

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

| 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 | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 86efde54dc7069251a8b007026c500d28e4239ce (Commit)

## Referenzen

- <https://go.dev/cl/826524>
- <https://go.dev/issue/81317>
- <https://groups.google.com/g/golang-announce/c/1y3fb2np35U>
- <https://pkg.go.dev/vuln/GO-2026-6355>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-56855) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_