CVE-2026-59800

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.4%, top 31% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
EG Score
9.8(medium)
EPSS
68.7%
KEV
Not listed

Published

July 7, 2026

Last Modified

July 10, 2026

Advisory Details (2)

Auto-updated Jul 11, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Missing Authorization and OS Command Injection in 9router · Advisory · decolua/9router · GitHub

https://github.com/decolua/9router/security/advisories/GHSA-g6g7-pvmx-m74p
generic

9Router < 0.4.44 - OS Command Injection via sudoPassword Parameter in Tailscale Install Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/9router-os-command-injection-via-sudopassword-parameter-in-tailscale-install-endpoint

Vendor Advisories for CVE-2026-59800(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
9router—0.4.44—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 40× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-12 16:16 UTCEG score recompute
  2. 2026-07-12 12:29 UTCEG score recompute
  3. 2026-07-12 08:42 UTCEG score recompute
  4. 2026-07-12 05:46 UTCEPSS rescore
  5. 2026-07-12 04:55 UTCEG score recompute
  6. 2026-07-12 01:08 UTCEG score recompute
  7. 2026-07-11 21:21 UTCEG score recompute
  8. 2026-07-11 17:34 UTCEG score recompute
  9. 2026-07-11 13:48 UTCEG score recompute
  10. 2026-07-11 10:01 UTCEG score recompute
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-11 08:27 UTCEPSS rescore
  13. 2026-07-11 06:14 UTCEG score recompute
  14. 2026-07-11 02:26 UTCEG score recompute
  15. 2026-07-10 22:40 UTCEG score recompute
  16. 2026-07-10 18:53 UTCEG score recompute
  17. 2026-07-10 15:07 UTCEG score recompute
  18. 2026-07-10 11:19 UTCEG score recompute
  19. 2026-07-10 07:32 UTCEG score recompute
  20. 2026-07-10 03:46 UTCEG score recompute
  21. 2026-07-09 23:59 UTCEG score recompute
  22. 2026-07-09 20:13 UTCEG score recompute
  23. 2026-07-09 19:10 UTCEPSS rescore
  24. 2026-07-09 19:10 UTCEPSS rescore
  25. 2026-07-09 16:26 UTCEG score recompute
Show 15 more
  1. 2026-07-09 12:37 UTCEG score recompute
  2. 2026-07-09 08:51 UTCEG score recompute
  3. 2026-07-09 05:04 UTCEG score recompute
  4. 2026-07-09 01:18 UTCEG score recompute
  5. 2026-07-08 21:31 UTCEG score recompute
  6. 2026-07-08 17:44 UTCEG score recompute
  7. 2026-07-08 15:16 UTCEPSS rescore
  8. 2026-07-08 15:16 UTCEPSS rescore
  9. 2026-07-08 13:58 UTCEG score recompute
  10. 2026-07-08 10:10 UTCEG score recompute
  11. 2026-07-08 06:23 UTCEG score recompute
  12. 2026-07-08 02:36 UTCEG score recompute
  13. 2026-07-07 22:50 UTCEG score recompute
  14. 2026-07-07 19:03 UTCEG score recompute
  15. 2026-07-07 19:01 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59800?
CVE-2026-59800 is a critical vulnerability published on July 7, 2026. 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…
When was CVE-2026-59800 disclosed?
CVE-2026-59800 was first published in the National Vulnerability Database on July 7, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59800 actively exploited?
CVE-2026-59800 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 68.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-59800?
CVE-2026-59800 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-59800?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59800, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-59800

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