{"id":"CVE-2026-54591","aliases":["GHSA-2wxc-x7rj-hg8f"],"url":"https://o3.security/vulnerability/CVE-2026-54591","summary":"AsyncSSH: SCP Path Traversal to Arbitrary File Write","details":"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.","published":"2026-07-08T20:33:57.420Z","modified":"2026-08-12T03:51:38.167494874Z","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"asyncssh","fixedVersion":"2.23.1"}],"fix":{"url":"https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de","label":"ronf/asyncssh@d730803"},"references":[{"type":"WEB","url":"https://github.com/ronf/asyncssh/releases/tag/v2.23.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54591.json"},{"type":"ADVISORY","url":"https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54591"},{"type":"FIX","url":"https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:38.167494874Z"}}