---
title: "CVE-2026-54591\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-54591?format=md
keywords: index, follow
---

# CVE-2026-54591

Publication date 8 July 2026

Last updated 16 July 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**8.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-54591?format=md#impact-score)

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## Description

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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| python-asyncssh | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.1 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | Required |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.1 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-54591)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-54591)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-54591)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-54591)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-54591>
* <https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de>
* <https://github.com/ronf/asyncssh/releases/tag/v2.23.1>
* <https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f>