What’s Vulnerable › Vulnerabilities

CVE-2026-54591: AsyncSSH: SCP Path Traversal to Arbitrary File Write

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-08 · updated 2026-10-25
• Weakness: CWE-22

Description

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.

Affected products

• ronf asyncssh: before 2.23.1

References

• https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de
• https://github.com/ronf/asyncssh/releases/tag/v2.23.1
• https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f

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