What is CVE-2026-59800?

CVE-2026-59800 is a critical-severity vulnerability in Decolua 9router, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-07-07.

How severe is CVE-2026-59800?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Decolua 9router

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)…

Vulnerability class: Command Injection (OS Command Injection)

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Decolua 9router — versions 0, 0.4.44

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-59800?: CVE-2026-59800 is a critical-severity vulnerability in Decolua 9router, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-07-07.
How severe is CVE-2026-59800?: Critical severity. CVSS v3 base score is 9.8 out of 10.