CVE-2026-54591CWE-22

AsyncSSH: SCP Path Traversal to Arbitrary File Write

High · published July 8, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
41.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00492 · 41.4th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-07-08T20:33Z
EPSS history
Timeline
  • 08 JUL 20:33Z
    AsyncSSH: SCP Path Traversal to Arbitrary File Write
    cvelistv5