# CVE-2026-54591: python-asyncssh: AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on...

CVE-2026-54591 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-54591, released July 8, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-54591
- Priority: High
- CVSS: 8.1 (high)
- EPSS: 0.0049
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 8, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-asyncssh Debian 14 | 2.24.0-1 | [DEBIAN-CVE-2026-54591](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54591.md) | Jul 8, 2026 |
| Linux | python-asyncssh Fedora 43 | 2.23.1-1.fc43 | [FEDORA-2026-574496D9AE](https://patchblox.com/security/data/fix/linux/fedora-2026-574496d9ae.md) | Jul 11, 2026 |
| Linux | python3-asyncssh Fedora 43 | 2.23.1-1.fc43 | [FEDORA-2026-574496D9AE](https://patchblox.com/security/data/fix/linux/fedora-2026-574496d9ae.md) | Jul 11, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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