CVE-2026-77473
AsyncSSH: SFTP Recursive Copy Path Traversal via Unsanitized Server-Supplied Filenames
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 2.24.1, recursive remote-to-local SFTP copies in SFTPClient._copy() in asyncssh/sftp.py, reached through get(), mget(), and copy(), trust filenames returned by a remote server's directory enumeration. A malicious or compromised SFTP server can return an absolute filename or a filename containing path separators and parent-directory traversal, causing destination path construction to escape the requested local directory and write attacker-selected content to locations writable by the client process. This issue is fixed in version 2.24.1.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| asyncssh ronf |
< 2.24.1 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.5 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/ronf/asyncssh/security/advisories/GHSA-q8m6-9rfx-39rfCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/ronf/asyncssh/commit/eaf7fd3b058ccb36b51ed932158d36cf304aa7c3CNA: GitHub_M · x_refsource_MISC
- https://github.com/ronf/asyncssh/releases/tag/v2.24.1CNA: GitHub_M · x_refsource_MISC
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