CVE catalog
CVE-2026-45309
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 2.23.0, AsyncSSH expands the OpenSSH
- Severity
- High · CVSS 8.2
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.59% · 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. Prior to 2.23.0, AsyncSSH expands the OpenSSH-compatible AuthorizedKeysFile %u token in asyncssh/config.py, asyncssh/connection.py, asyncssh/auth_keys.py, and asyncssh/misc.py with the raw SSH username during pre-authentication server config reload, allowing a server configured with AuthorizedKeysFile authorized_keys/%u to read an authorized-keys file outside the intended directory when the SSH username contains /, \, or .. path traversal segments and authenticate with an attacker-selected key file. This issue is fixed in version 2.23.0.
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 | vulnerable |
| Debian | python-asyncssh | bookworm | 2.10.1-2+deb12u2 | vulnerable |
| Debian | python-asyncssh | bookworm-security | 2.10.1-2+deb12u1 | vulnerable |
| Cpe | python-asyncssh | Not reported | Not reported | vulnerable |
| Ubuntu | python-asyncssh | 16.04 | 1.2.0-1 | vulnerable |
| Ubuntu | python-asyncssh | 16.04 | 1.2.1-1 | vulnerable |
| Ubuntu | python-asyncssh | 16.04 | 1.3.0-1 | vulnerable |
| Ubuntu | python-asyncssh | pro | 2.10.1-2 | vulnerable |
| Ubuntu | python-asyncssh | pro | 2.10.1-2ubuntu0.1 | vulnerable |
| Ubuntu | python-asyncssh | pro | 2.10.1-2ubuntu0.1+esm1 | vulnerable |
| Ubuntu | python-asyncssh | 20.04 | 1.12.2-1 | vulnerable |
| Ubuntu | python-asyncssh | 20.04 | 1.12.2-1ubuntu0.1 | vulnerable |
| Ubuntu | python-asyncssh | 20.04 | 1.12.2-1ubuntu0.2 | vulnerable |
| Ubuntu | python-asyncssh | 26.04 | 2.20.0-1 | vulnerable |
| Ubuntu | python-asyncssh | 26.04 | 2.21.1-1 | vulnerable |
| Opensuse | python-asyncssh | tumbleweed | 2.23.1-1.1 | fixed |
| Cpe | asyncssh | Not reported | 2.23.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-asyncssh | source | sid | 2.23.0-1 | not yet assigned | Not reported | Not reported |
| Debian | python-asyncssh | source | forky | 2.23.0-1 | not yet assigned | Not reported | Not reported |
| Debian | python-asyncssh | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | python-asyncssh | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Opensuse | python-asyncssh | rpm | tumbleweed | 2.23.1-1.1 | Not reported | OPENSUSE-SU-2026:11042-1 | Not reported |
| Cpe | asyncssh | cpe | Not reported | 2.23.0 | Not reported | NVD-CVE-2026-45309 | Not reported |
Notes
[trixie] python-asyncssh: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-asyncssh]Affected
Source package: [python-asyncssh]
Details (4)
2.10.1-2+deb12u2· all · bookwormAffected
nvd · python-asyncssh · debian · bookworm; nvd · python-asyncssh · debian · 12
2.10.1-2+deb12u2· all · bookwormAffected
nvd · python-asyncssh · debian · bookworm; nvd · python-asyncssh · debian · 12
2.10.1-2+deb12u1· all · bookworm-securityAffected
nvd · python-asyncssh · debian · bookworm; nvd · python-asyncssh · debian · 12
2.10.1-2+deb12u1· all · bookworm-securityAffected
nvd · python-asyncssh · debian · bookworm; nvd · python-asyncssh · debian · 12
- [python-asyncssh-doc]Affected
Source package: [python-asyncssh]
Details (4)
2.10.1-2+deb12u2· all · bookwormAffected
nvd · python-asyncssh · debian · bookworm; nvd · python-asyncssh · debian · 12
2.10.1-2+deb12u2· all · bookwormAffected
nvd · python-asyncssh · debian · bookworm; nvd · python-asyncssh · debian · 12
2.10.1-2+deb12u1· all · bookworm-securityAffected
nvd · python-asyncssh · debian · bookworm; nvd · python-asyncssh · debian · 12
2.10.1-2+deb12u1· all · bookworm-securityAffected
nvd · python-asyncssh · debian · bookworm; nvd · python-asyncssh · debian · 12
[Debian 13 (Trixie)]
- [python3-asyncssh]Affected
Source package: [python-asyncssh]
Details (2)
2.20.0-1· all · trixieAffected
nvd · python-asyncssh · debian · 13
2.20.0-1· all · trixieAffected
nvd · python-asyncssh · debian · 13
- [python-asyncssh-doc]Affected
Source package: [python-asyncssh]
Details (2)
2.20.0-1· all · trixieAffected
nvd · python-asyncssh · debian · 13
2.20.0-1· all · trixieAffected
nvd · python-asyncssh · debian · 13
[openSUSE Tumbleweed]
- [python313-asyncssh]Unknown
Source package: [python-asyncssh]
Details (1)
2.23.1-1.2· noarch · tumbleweedUnknown · Fixed:
2.23.1-1.1Version impact unknown
nvd · python-asyncssh · opensuse · tumbleweed
- [python314-asyncssh]Unknown
Source package: [python-asyncssh]
Details (1)
2.23.1-1.2· noarch · tumbleweedUnknown · Fixed:
2.23.1-1.1Version impact unknown
nvd · python-asyncssh · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11042-1.json]
- [https://github.com/ronf/asyncssh/commit/2af2382cce946c959a378a62f257af253dc4ab51]
- [https://github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88]
- [https://github.com/ronf/asyncssh/security/advisories/GHSA-g794-3fmp-753h]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-45309]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-45309]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-45309]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11042-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-45309]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45309.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]