CVE catalog
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
- Severity
- Medium · CVSS 6.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.39% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | python-asyncssh | sid | 2.24.0-2 | fixed |
| Debian | python-asyncssh | forky | 2.24.0-2 | fixed |
| Debian | python-asyncssh | trixie | 2.20.0-1 | not affected |
| Debian | python-asyncssh | bookworm | 2.10.1-2+deb12u2 | not affected |
| Debian | python-asyncssh | bookworm-security | 2.10.1-2+deb12u1 | not affected |
| Cpe | python-asyncssh | Not reported | Not reported | vulnerable |
| Pip | asyncssh | Not reported | 2.23.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-asyncssh | source | sid | 2.24.0-1 | not yet assigned | Not reported | [1141817] |
| Debian | python-asyncssh | source | forky | 2.24.0-1 | not yet assigned | Not reported | [1141817] |
| Debian | python-asyncssh | source | trixie | Not affected | unimportant | Not reported | [1141817] |
| Debian | python-asyncssh | source | bookworm | Not affected | unimportant | Not reported | [1141817] |
| Pip | asyncssh | pip | Not reported | 2.23.1 | Not reported | GHSA-QR67-GV47-XWWH | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-asyncssh]Not affected
Source package: [python-asyncssh]
Details (4)
2.10.1-2+deb12u2· all · bookwormNot affected
nvd · python-asyncssh · debian · bookworm
2.10.1-2+deb12u2· all · bookwormNot affected
nvd · python-asyncssh · debian · bookworm
2.10.1-2+deb12u1· all · bookworm-securityNot affected
nvd · python-asyncssh · debian · bookworm
2.10.1-2+deb12u1· all · bookworm-securityNot affected
nvd · python-asyncssh · debian · bookworm
- [python-asyncssh-doc]Not affected
Source package: [python-asyncssh]
Details (4)
2.10.1-2+deb12u2· all · bookwormNot affected
nvd · python-asyncssh · debian · bookworm
2.10.1-2+deb12u2· all · bookwormNot affected
nvd · python-asyncssh · debian · bookworm
2.10.1-2+deb12u1· all · bookworm-securityNot affected
nvd · python-asyncssh · debian · bookworm
2.10.1-2+deb12u1· all · bookworm-securityNot affected
nvd · python-asyncssh · debian · bookworm
Observed:
References
- [https://github.com/advisories/GHSA-qr67-gv47-xwwh]
- [https://github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88]
- [https://github.com/ronf/asyncssh/releases/tag/v2.23.1]
- [https://github.com/ronf/asyncssh/security/advisories/GHSA-qr67-gv47-xwwh]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-54590]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-54590]
- [https://security-tracker.debian.org/tracker/CVE-2026-54590]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54590.json]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]