CVE-2026-45309

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Source
https://cve.org/CVERecord?id=CVE-2026-45309
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45309.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-45309
Aliases
Downstream
Related
Published
2026-07-17T18:40:02.428Z
Modified
2026-07-19T03:46:59.320847878Z
Severity
  • 8.2 (High) CVSS_V4 - 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 CVSS Calculator
Summary
AsyncSSH `AuthorizedKeysFile %u` path traversal allows attacker-selected authorized keys to authenticate a traversal username
Details

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/authkeys.py, and asyncssh/misc.py with the raw SSH username during pre-authentication server config reload, allowing a server configured with AuthorizedKeysFile authorizedkeys/%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.

Database specific 
{
    "cwe_ids": [
        "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45309.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/ronf/asyncssh

Affected ranges

Type
GIT
Repo
https://github.com/ronf/asyncssh
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
2af2382cce946c959a378a62f257af253dc4ab51
Fixed
3d515ba9ba0cd9990d248bdf62bcf05d51261a88
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.23.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.1.0
v0.2.0
v0.3.0
v0.4.0
v0.5.0
v0.6.0
v0.7.0
v0.8.0
v0.8.1
v0.8.2
v0.8.3
v0.8.4
v0.9.0
v0.9.1
v0.9.2
v1.*
v1.0.0
v1.0.1
v1.1.0
v1.1.1
v1.10.0
v1.10.1
v1.11.0
v1.11.1
v1.12.0
v1.12.1
v1.12.2
v1.13.0
v1.13.1
v1.13.2
v1.13.3
v1.14.0
v1.15.0
v1.15.1
v1.16.0
v1.16.1
v1.17.0
v1.17.1
v1.18.0
v1.2.0
v1.2.1
v1.3.0
v1.3.1
v1.3.2
v1.4.0
v1.4.1
v1.5.0
v1.5.1
v1.5.2
v1.5.3
v1.5.4
v1.5.5
v1.5.6
v1.6.0
v1.6.1
v1.6.2
v1.7.1
v1.7.2
v1.7.3
v1.8.0
v1.8.1
v1.9.0
v2.*
v2.0.0
v2.0.1
v2.1.0
v2.10.0
v2.10.1
v2.11.0
v2.12.0
v2.13.0
v2.13.1
v2.13.2
v2.14.0
v2.14.1
v2.14.2
v2.15.0
v2.16.0
v2.17.0
v2.18.0
v2.19.0
v2.2.0
v2.2.1
v2.20.0
v2.21.0
v2.21.1
v2.22.0
v2.23.0
v2.3.0
v2.4.0
v2.4.1
v2.4.2
v2.5.0
v2.6.0
v2.7.0
v2.7.1
v2.7.2
v2.8.0
v2.8.1
v2.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45309.json"