{"id":"DEBIAN-CVE-2026-77473","details":"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.","modified":"2026-11-10T09:00:08.121905677Z","published":"2026-11-09T22:18:54.713Z","upstream":["CVE-2026-77473"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-77473"}],"affected":[{"package":{"name":"python-asyncssh","ecosystem":"Debian:12","purl":"pkg:deb/debian/python-asyncssh?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.10.1-2","2.10.1-2+deb12u1","2.10.1-2+deb12u2","2.15.0-1","2.16.0-1","2.17.0-1","2.17.0-2","2.18.0-1","2.19.0-1","2.20.0-1","2.21.0-1","2.21.1-1","2.22.0-1","2.22.0-2","2.23.0-1","2.24.0-1","2.24.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77473.json"}},{"package":{"name":"python-asyncssh","ecosystem":"Debian:13","purl":"pkg:deb/debian/python-asyncssh?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.20.0-1","2.21.0-1","2.21.1-1","2.22.0-1","2.22.0-2","2.23.0-1","2.24.0-1","2.24.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77473.json"}},{"package":{"name":"python-asyncssh","ecosystem":"Debian:14","purl":"pkg:deb/debian/python-asyncssh?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.20.0-1","2.21.0-1","2.21.1-1","2.22.0-1","2.22.0-2","2.23.0-1","2.24.0-1","2.24.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77473.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"}]}