HighFix available
python-asyncssh — security advisory
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.
- Products
- python-asyncssh
- Affected 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
- Fixed versions
- 2.24.0-1
- CVEs
- CVE-2026-54591
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:17 UTC · Revision 2
Source evidence
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.
osv:DEBIAN-CVE-2026-54591
python-asyncssh
Fixed versions: Not specified
python-asyncssh
Fixed versions: Not specified
python-asyncssh
Fixed versions: 2.24.0-1
Complete source record
{
"id": "145a12d1ac963ad438c645c854d4447e7da5ebd1c0c33082473e98fcc73346b4",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-54591",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-54591",
"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.",
"evidence": "osv:DEBIAN-CVE-2026-54591",
"products": [
{
"name": {
"value": "python-asyncssh",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.10.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.1-2+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.1-2+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "2.15.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.16.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.17.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.17.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.18.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.19.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.20.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.21.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.21.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.22.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.22.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.23.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.24.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.24.0-2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "python-asyncssh",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.20.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.21.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.21.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.22.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.22.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.23.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.24.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.24.0-2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "python-asyncssh",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.24.0-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "2.20.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.21.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.21.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.22.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.22.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "2.23.0-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-54591",
"aliases": [
"DEBIAN-CVE-2026-54591"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-asyncssh",
"purl": "pkg:deb/debian/python-asyncssh?arch=source&distro=bookworm",
"ecosystem": "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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54591.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-asyncssh",
"purl": "pkg:deb/debian/python-asyncssh?arch=source&distro=trixie",
"ecosystem": "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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54591.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.24.0-1"
}
]
}
],
"package": {
"name": "python-asyncssh",
"purl": "pkg:deb/debian/python-asyncssh?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54591.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T11:47:33.112391311Z",
"provider": "osv",
"upstream": [
"CVE-2026-54591"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-54591"
]
},
"related_cves": [
{
"value": "CVE-2026-54591",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450790,
"published_at": "2026-07-08T21:16:49.657+00:00"
}