DEBIAN-CVE-2026-54590
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.
DEBIAN-CVE-2026-54590
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-54590
python-asyncssh
Source reference: /affected/0/package/name
- Affected versions
- 2.20.0-1
Source reference:
/affected/0/versions2.21.0-1Source reference:
/affected/0/versions2.21.1-1Source reference:
/affected/0/versions2.22.0-1Source reference:
/affected/0/versions2.22.0-2Source reference:
/affected/0/versions2.23.0-1Source reference:
/affected/0/versions - Fixed versions
- 2.24.0-1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"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-2026-54590.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57818 · Revision 1
- Added to Heist Feed
- Publisher date