CVE-2026-59800

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).

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/decolua/9router/security/advisories/GHSA-g6g7-pvmx-m74p
https://www.vulncheck.com/advisories/9router-os-command-injection-via-sudopassword-parameter-in-tailscale-install-endpoint
https://github.com/decolua/9router/security/advisories/GHSA-g6g7-pvmx-m74p

Configurations

No configuration.

History

07 Jul 2026, 20:16

Type	Values Removed	Values Added
References	~~() https://github.com/decolua/9router/security/advisories/GHSA-g6g7-pvmx-m74p -~~	() https://github.com/decolua/9router/security/advisories/GHSA-g6g7-pvmx-m74p -

07 Jul 2026, 19:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-07 19:16

Updated : 2026-07-10 17:56

NVD link : CVE-2026-59800

Mitre link : CVE-2026-59800

CVE.ORG link : CVE-2026-59800

JSON object : View

Products Affected

No product.

CWE

CWE-78

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

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