---
cve: "CVE-2026-54591"
severity: "HIGH"
cvss: 8.1
epss: "0.5%"
vendor: "ronf"
kev: false
exploited: false
published: "2026-07-08 20:33:57"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T21:51:59+02:00"
---

# CVE-2026-54591

> 8.1 HIGH · 🧪 PoC

## Beschreibung

AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.1, a malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences because _parse_cd_args in scp.py returns server-provided names verbatim and _recv_files joins them to the destination path without enforcing the target directory boundary. This issue is fixed in version 2.23.1.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- d730803b8e4e94c20c7580d90f94d1e05f9f58de (Commit)
- 1b5839f3827f7bf546fc311cc8da77788a9d22f7 (Commit)

## Referenzen

- <https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f>
- <https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de>
- <https://github.com/ronf/asyncssh/releases/tag/v2.23.1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-54591) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_