{"answers":{"affected":"3 open source packages ship an affected version, including asyncssh.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54590 exists.","fix":"Upgrade asyncssh to 2.23.1 or later.","what":"CVE-2026-54590 is a medium-severity path traversal vulnerability in ronf asyncssh, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-54590 and fix it if it is affected.\n\nWhat it is: CVE-2026-54590 is a medium-severity path traversal vulnerability in ronf asyncssh, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54590 exists.\n\nAffected packages and fixed versions:\n- asyncssh (PyPI): affected all versions; fixed in 2.23.1\n- asyncssh (PyPI): affected all versions; fixed in 2.23.1\n- asyncssh (PyPI): affected all versions; fixed in 2.23.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-54590/ (Markdown: https://insights.sbomify.com/CVE-2026-54590/index.md)","id":"CVE-2026-54590","markdown":"https://insights.sbomify.com/CVE-2026-54590/index.md","name":"CVE-2026-54590","record":{"aliases":["CLEANSTART-2026-IL04203","DEBIAN-CVE-2026-54590","ECHO-3b00-f8ea-bea7","GHSA-qr67-gv47-xwwh","MINI-56v4-gf5f-fxwp","MINI-c428-pwrv-rr6c","MINI-ff97-66g9-mwgh","PYSEC-2026-3809","UBUNTU-CVE-2026-54590"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"AsyncSSH Python library","requires_auth":"none","summary":"Attackers can bypass authorized keys directory restrictions via tilde or environment variable expansion in AsyncSSH, potentially reading sensitive files.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key"},{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"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. 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.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"AsyncSSH AuthorizedKeysFile username substitution bypass through ~ and environment expansion","id":"CVE-2026-54590","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"AsyncSSH: SCP Path Traversal to Arbitrary File Write","id":"CVE-2026-54591"},"packages":[{"ecosystem":"PyPI","fixed":["2.23.1"],"introduced":["0"],"last_affected":[],"package":"asyncssh","purl":null,"source":"GHSA-qr67-gv47-xwwh"},{"ecosystem":"PyPI","fixed":["2.23.1"],"introduced":["0"],"last_affected":[],"package":"asyncssh","purl":"pkg:pypi/asyncssh","source":"GHSA-qr67-gv47-xwwh"},{"ecosystem":"PyPI","fixed":["2.23.1"],"introduced":["0"],"last_affected":[],"package":"asyncssh","purl":"pkg:pypi/asyncssh","source":"PYSEC-2026-3809"}],"prev":{"headline":"Poweradmin has Host Header Injection in OIDC redirect_uri, SAML ACS/SLO URL, and Logout Redirect Construction.","id":"CVE-2026-54588"},"products":["asyncssh"],"published":"2026-07-08","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-10","vendors":["ronf"]},"summary":"Attackers can bypass authorized keys directory restrictions via tilde or environment variable expansion in AsyncSSH, potentially reading sensitive files.","url":"https://insights.sbomify.com/CVE-2026-54590/"}