---
cve: "CVE-2026-42189"
severity: "HIGH"
cvss: 7.5
epss: "48%"
vendor: "Eugeny"
kev: false
exploited: false
published: "2026-05-08 20:16:31"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-14T14:00:34+02:00"
---

# CVE-2026-42189

> 7.5 HIGH · 🧪 PoC

## Beschreibung

Russh is a Rust SSH client & server library. Prior to version 0.60.1, a pre-authentication denial-of-service vulnerability exists in the server's keyboard-interactive authentication handler. A malicious client can crash any russh-based server that implements keyboard-interactive auth (e.g., for 2FA/TOTP) with a single malformed packet, requiring no credentials. This issue has been patched in version 0.60.1.

## 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)

- 5a6ca29ef2171b070433308fcf0e43785b608071 (Commit)
- 6c3c80a9b6d60763d6227d60fa8310e57172a4d1 (Commit)

## Referenzen

- <https://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmg>
- <https://github.com/Eugeny/russh/commit/6c3c80a9b6d60763d6227d60fa8310e57172a4d1>
- <https://github.com/Eugeny/russh/releases/tag/v0.60.1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-42189) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_