Path traversal in AsyncSSH - CVE-2026-77473
Published: October 5, 2026
Vulnerability identifier: #VU153259
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-77473
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to write files to arbitrary locations on the client filesystem.
The vulnerability exists due to path traversal in SFTPClient._copy() when processing server-supplied directory entry filenames during recursive remote-to-local copies. A remote attacker can return a directory entry with a crafted filename to write files to arbitrary locations on the client filesystem.
User interaction is required to initiate a recursive remote-to-local copy.
Affected software
AsyncSSH
How to mitigate CVE-2026-77473
Install security update from vendor's website.
AsyncSSH - update to 2.24.1