Path traversal in AsyncSSH - CVE-2026-45309
Published: May 27, 2026
Vulnerability identifier: #VU132349
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-45309
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Ron Fredericks, LectureMaker
Affected software:
AsyncSSH
AsyncSSH
Detailed vulnerability description
The vulnerability allows a remote attacker to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences within the %u expansion in the AuthorizedKeysFile configuration parameter. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.
How to mitigate CVE-2026-45309
Install updates from vendor's website.