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    4 vulnerabilities by ronf

    CVE-2026-54591 (GCVE-0-2026-54591)

    Vulnerability from nvd – Published: 2026-07-08 20:33 – Updated: 2026-07-09 14:40
    VLAI
    Title
    AsyncSSH: SCP Path Traversal to Arbitrary File Write
    Summary
    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 2.23.1, a malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences because _parse_cd_args in scp.py returns server-provided names verbatim and _recv_files joins them to the destination path without enforcing the target directory boundary. This issue is fixed in version 2.23.1.
    Severity
    8.1 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    Assigner
    References
    Impacted products
    Vendor Product Version
    ronf asyncssh Affected: < 2.23.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-54590 (GCVE-0-2026-54590)

    Vulnerability from nvd – Published: 2026-07-08 20:36 – Updated: 2026-07-08 20:36
    VLAI
    Title
    AsyncSSH AuthorizedKeysFile username substitution bypass through ~ and environment expansion
    Summary
    AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Version 2.23.0 contains an incomplete fix for CVE-2026-45309 in SSHServerConfig._set_tokens that blocks /, , and .. before %u substitution in AuthorizedKeysFile but does not block a leading ~ or ${ENV}, allowing later expansion in _expand_val and Path(filename).expanduser() to escape the intended authorized-keys directory. This issue is fixed in version 2.23.1.
    Severity
    5.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    • CWE-639 - Authorization Bypass Through User-Controlled Key
    Assigner
    References
    Impacted products
    Vendor Product Version
    ronf asyncssh Affected: < 2.23.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-54590 (GCVE-0-2026-54590)

    Vulnerability from cvelistv5 – Published: 2026-07-08 20:36 – Updated: 2026-07-08 20:36
    VLAI
    Title
    AsyncSSH AuthorizedKeysFile username substitution bypass through ~ and environment expansion
    Summary
    AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Version 2.23.0 contains an incomplete fix for CVE-2026-45309 in SSHServerConfig._set_tokens that blocks /, , and .. before %u substitution in AuthorizedKeysFile but does not block a leading ~ or ${ENV}, allowing later expansion in _expand_val and Path(filename).expanduser() to escape the intended authorized-keys directory. This issue is fixed in version 2.23.1.
    Severity
    5.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    • CWE-639 - Authorization Bypass Through User-Controlled Key
    Assigner
    References
    Impacted products
    Vendor Product Version
    ronf asyncssh Affected: < 2.23.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
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    CVE-2026-54591 (GCVE-0-2026-54591)

    Vulnerability from cvelistv5 – Published: 2026-07-08 20:33 – Updated: 2026-07-09 14:40
    VLAI
    Title
    AsyncSSH: SCP Path Traversal to Arbitrary File Write
    Summary
    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 2.23.1, a malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences because _parse_cd_args in scp.py returns server-provided names verbatim and _recv_files joins them to the destination path without enforcing the target directory boundary. This issue is fixed in version 2.23.1.
    Severity
    8.1 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    Assigner
    References
    Impacted products
    Vendor Product Version
    ronf asyncssh Affected: < 2.23.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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