CVE-2026-77473: medium-severity vulnerability in ronf asyncssh
AsyncSSH: SFTP Recursive Copy Path Traversal via Unsanitized Server-Supplied Filenames
Published · Updated
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10Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Affected products
ronf · asyncsshRelated CVEs — ronf asyncssh
In the same product, most dangerous first.
CVE-2026-45309HIGHAsyncSSH `AuthorizedKeysFile %u` path traversal allows attacker-selected authorized keys to authenticate a traversal usernameEPSS 0.6%CVE-2026-54591HIGHAsyncSSH: SCP Path Traversal to Arbitrary File WriteEPSS 0.5%CVE-2026-62949MEDIUMAsyncSSH: asyncio event-loop freeze via SSH maximum packet size = 0 in SSH_MSG_CHANNEL_OPEN / OPEN_CONFIRMATIONEPSS 0.4%CVE-2026-54590MEDIUMAsyncSSH AuthorizedKeysFile username substitution bypass through ~ and environment expansionEPSS 0.3%CVE-2026-102643HIGHAsyncSSH: SFTPServer Chroot EscapeEPSS —