CVE-2026-59800
Confirmed PUBLISHED9Router < 0.4.44 - OS Command Injection via sudoPassword Parameter in Tailscale Install Endpoint
Recommended Action
Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.
At a Glance
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).
- CVE Published
- Jul 07, 2026
- Exploited Since
- Jul 10, 2026
- CVSS
- 9.2 Critical
- EPSS
- 1.3%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| decolua |
9router
|
0 to < 0.4.44 |
Affected |
| decolua |
9router
|
0.4.44 |
Unaffected |
CVE References
- GitHub Security Advisory (GHSA-g6g7-pvmx-m74p) github.com · Vendor Advisory https://github.com/decolua/9router/security/advisories/GHSA-g6g7-pvmx...
- Third-Party Advisory — vulncheck.com vulncheck.com · Third-Party Advisory https://www.vulncheck.com/advisories/9router-os-command-injection-via...
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2026-07-31 00:00 UTC |
| KEVIntel | 2026-08-01 11:09 UTC |
Operational indicators for this CVE are listed on the Detection tab.
Observed Exploitation Attempts
Exploitation attempts against this vulnerability observed first-hand by KEVIntel private honeypots over the last 30 days.
- Attempts Observed
- 12
- Unique Attacker IPs
- 3
- Attacker Countries
- 🇩🇪 🇳🇱 🇹🇷
- Sensors Observed
- 6
Exploitation Attempts Over the Last 24 Days
First observed (all time) 2026-07-10 11:22 UTC · Last observed 2026-07-14 21:50 UTC
See more exploitation detail
- Pro — sensor software/region breakdown and 24h/7d window summaries.
- Enterprise — raw attacker IPs, request paths, User-Agents, and payloads.
Indicators of Compromise (IoCs)
Attacker IP IoCs observed in KEVIntel sensors are available to Pro and Enterprise accounts on the Detection tab and through the Pro API.
Learn about Pro API accessObserved Detection Signals (30d)
Aggregate counts from KEVIntel sensor telemetry for this CVE.
- Distinct request targets
- 1
- Distinct User-Agents
- 1
The specific request targets and User-Agents attackers are using are available on Pro and Enterprise plans.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2026-07-31 00:00:00 UTC · The Shadowserver
Active exploitation observed
Recorded 2026-07-13 06:46:32 UTC · KEVIntel sensor
Proof of concept available
Recorded 2026-07-08 04:50:47 UTC · Pruva
Weaknesses (CWE)
-
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
pruva · Created 2026-07-08 04:50:47 UTC
Severity: CRITICAL | CVE: CVE-2026-59800 | Package: 9router (npm)
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC 2 days ago00:00 UTC · 2 days ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
06:46 UTC 20 days ago06:46 UTC · 20 days ago
Observed by KEVIntel sensors
Evidence-backed exploitation signal
-
11:22 UTC 22 days ago11:22 UTC · 22 days ago
Indicators of compromise added (3)
Indicators of compromise recorded
-
04:50 UTC 25 days ago04:50 UTC · 25 days ago
Public PoC available
Public proof-of-concept code published
-
18:19 UTC 25 days ago18:19 UTC · 25 days ago
CVE published
Vulnerability disclosed publicly
-
14:39 UTC 25 days ago14:39 UTC · 25 days ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2026-59800
{
"cve_id": "CVE-2026-59800",
"title": "9Router < 0.4.44 - OS Command Injection via sudoPassword Parameter in Tailsca...",
"affected_vendor": "decolua",
"affected_product": "9router",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 9.2,
"epss_score": 0.01338,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": true
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}