---
cve: "CVE-2026-73489"
severity: "MEDIUM"
cvss: 4.3
epss: "0.3%"
vendor: "Eugeny"
kev: false
exploited: false
published: "2026-08-13 22:17:26"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T12:20:28+02:00"
---

# CVE-2026-73489

> 4.3 MEDIUM · 🧪 PoC

## Beschreibung

Russh is a Rust SSH client & server library. Prior to 0.62.4, an authenticated SSH client can cause a denial of service by sending a pty-req channel request with more than 130 terminal-mode records. The parser in russh/src/server/encrypted.rs stores terminal modes in a fixed 130-entry [(Pty::TTY_OP_END, 0); 130] array but continues increasing the mode count, then constructs an out-of-bounds slice and panics before the application pty_request handler runs. The panic terminates the server session task without causing memory corruption. This issue is fixed in version 0.62.4.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 8912512371820167a12a0a638bd666856ce458ad (Commit)
- 0089c89c94753bebbec12b956c07a1cd38740379 (Commit)

## Referenzen

- <https://github.com/Eugeny/russh/security/advisories/GHSA-cqjc-rmpq-xprq>
- <https://github.com/Eugeny/russh/commit/8912512371820167a12a0a638bd666856ce458ad>
- <https://github.com/Eugeny/russh/releases/tag/v0.62.4>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73489) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_