CVE-2026-59800

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Source
https://cve.org/CVERecord?id=CVE-2026-59800
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59800.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-59800
Aliases
Published
2026-07-07T18:19:17.154Z
Modified
2026-07-09T04:02:33.882347111Z
Severity
  • 9.2 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
9Router < 0.4.44 - OS Command Injection via sudoPassword Parameter in Tailscale Install Endpoint
Details

9Router before 0.4.44 contains an OS command injection vulnerability in the unauthenticated POST /api/tunnel/tailscale-install endpoint (this route is not covered by the dashboard middleware matcher, so no authorization check is applied). The sudoPassword field from the request body is written to the stdin of a 'sudo -S sh' child process. When sudo does not prompt for a password (the process runs as root, NOPASSWD is configured, or a recent sudo timestamp cache exists), the sudoPassword value is interpreted by sh as a shell command, allowing a remote unauthenticated attacker to execute arbitrary OS commands. Exploitation evidence was first observed by the Shadowserver Foundation on 2026-07-04 (UTC).

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59800.json",
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-78"
    ]
}
References

Affected packages

Git / github.com/decolua/9router

Affected ranges

Type
GIT
Repo
https://github.com/decolua/9router
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
9e87935c0e53f46d6ae04fbec656fc4d971547d7
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.4.44"
        },
        {
            "introduced": "9Router"
        }
    ]
}

Affected versions

v0.*
v0.2.21
v0.2.27
v0.2.31
v0.2.36
v0.2.43
v0.2.52
v0.2.56
v0.2.67
v0.2.70
v0.2.71
v0.2.79
v0.2.89
v0.3.17
v0.3.34
v0.3.42
v0.3.47
v0.3.75
v0.3.83
v0.3.86
v0.3.87
v0.3.89
v0.3.90
v0.3.91
v0.3.97
v0.3.98
v0.4.1
v0.4.10
v0.4.11
v0.4.12
v0.4.13
v0.4.14
v0.4.16
v0.4.18
v0.4.19
v0.4.2
v0.4.20
v0.4.25
v0.4.27
v0.4.28
v0.4.29
v0.4.3
v0.4.30
v0.4.31
v0.4.33
v0.4.36
v0.4.37
v0.4.38
v0.4.39
v0.4.4
v0.4.41
v0.4.6
v0.4.8

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59800.json"