CVE-2026-45309
Medium · 5.9AsyncSSH `AuthorizedKeysFile %u` path traversal allows attacker-selected authorized keys to authenticate a traversal username
CVSS
5.9
EPSS
0.6%
Published
May 27, 2026
CISA due date
—
The record
AsyncSSH 2.22.0 expands the OpenSSH-compatible `AuthorizedKeysFile` `%u` token with the raw SSH username during pre-authentication server config reload. A server configured with a documented per-user key pattern such as `AuthorizedKeysFile authorized_keys/%u` can be made to read an authorized-keys file outside the intended directory when the SSH username contains path traversal segments. If the attacker can place or reference a readable authorized-keys-format file containing their public key, the attacker can authenticate over SSH as the traversal username.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Tumbleweed | python-asyncssh | 0 | 2.23.1-1.1 |
Related vulnerabilities
- CVE-2026-81163 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')… CWE-22
- CVE-2026-112049 Vita3K before build 4187 contains a path traversal (zip slip) vulnerability in… CWE-22
- CVE-2026-112005 WhoDB 0.104.0 before 0.135.0 contains a path traversal vulnerability that allows remote… CWE-22
- CVE-2026-61702 OpenPrinting CUPS is an open source printing system for Linux and other Unix-like… CWE-22
- CVE-2026-104871 The Angular SSR is a server-rise rendering tool for Angular applications. CWE-22
- CVE-2026-102991 Mako is a template library written in Python. CWE-22
- CVE-2026-101894 The decompress package for Node.js extracts archives. CWE-22
- CVE-2026-100689 GitPython before 3.1.62 does not validate the `path` field read from an untrusted… CWE-22