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CVE-2026-45309

CVE-2026-45309 · AsyncSSH `AuthorizedKeysFile %u` path traversal allows attacker-selected authorized keys to authenticate a traversal username

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 2.23.0, AsyncSSH expands the OpenSSH-compatible AuthorizedKeysFile %u token in asyncssh/config.py, asyncssh/connection.py, asyncssh/auth_keys.py, and asyncssh/misc.py with the raw SSH username during pre-authentication server config reload, allowing a server configured with AuthorizedKeysFile authorized_keys/%u to read an authorized-keys file outside the intended directory when the SSH username contains /, \, or .. path traversal segments and authenticate with an attacker-selected key file. This issue is fixed in version 2.23.0.

CVSS 8.2 · High · EPSS 0.6% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • asyncssh

    Versions
    • < 2.23.0: Affected

    No fix published

  • python-asyncssh Debian:12

    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
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-asyncssh Debian:13

    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
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-asyncssh Debian:14

    Versions
    • 2.20.0-1
    • 2.21.0-1
    • 2.21.1-1
    • 2.22.0-1
    • 2.22.0-2
    Affected ranges
    • ECOSYSTEM: < 2.23.0-1

    Update to 2.23.0-1

  • asyncssh PyPI

    Versions
    • 2.22.0
    Affected ranges
    • ECOSYSTEM: ≥ 2.22.0, < 2.23.0

    Update to 2.23.0

  • python-asyncssh Ubuntu:16.04:LTS

    Versions
    • 1.2.0-1
    • 1.2.1-1
    • 1.3.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-asyncssh Ubuntu:Pro:18.04:LTS

    Versions
    • 1.8.1-2
    • 1.11.0-2
    • 1.11.1-1
    • 1.11.1-1ubuntu0.1~esm1
    • 1.11.1-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-asyncssh Ubuntu:20.04:LTS

    Versions
    • 1.12.2-1
    • 1.12.2-1ubuntu0.1
    • 1.12.2-1ubuntu0.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-asyncssh Ubuntu:Pro:22.04:LTS

    Versions
    • 2.5.0-1
    • 2.5.0-1ubuntu0.1~esm1
    • 2.5.0-1ubuntu0.1
    • 2.5.0-1ubuntu0.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-asyncssh Ubuntu:Pro:24.04:LTS

    Versions
    • 2.10.1-2
    • 2.10.1-2ubuntu0.1
    • 2.10.1-2ubuntu0.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-asyncssh Ubuntu:26.04:LTS

    Versions
    • 2.20.0-1
    • 2.21.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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