CVE-2026-59800

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This critical-severity CVE scores 9.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 2.0% (80th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 2.0%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

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
9.8CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.0%
EPSS %ILE
80th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 7, 2026

Last Modified

July 10, 2026

Advisory Details (2)

Auto-updated Oct 11, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

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

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

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 rangeFix by version rangeDependents
9router—
  • every version up to 0.4.44: fixed in 0.4.44
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 31× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 146 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 46 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:36 UTCEG score recompute
  2. 2026-10-11 16:51 UTCEG score recompute
  3. 2026-10-11 14:13 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  6. 2026-10-09 20:07 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  7. 2026-10-08 17:13 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  8. 2026-10-07 23:48 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  9. 2026-10-06 15:18 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  10. 2026-10-05 17:43 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  11. 2026-10-03 14:26 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  12. 2026-10-02 17:56 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  15. 2026-09-29 15:22 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  16. 2026-09-28 13:51 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  17. 2026-09-28 13:36 UTCEG score recompute
  18. 2026-09-27 13:48 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  19. 2026-09-26 15:59 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  20. 2026-09-24 14:04 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  21. 2026-09-23 17:54 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  22. 2026-09-23 06:16 UTCEG score recompute
  23. 2026-09-18 19:28 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  24. 2026-09-18 05:50 UTCEG score recompute
  25. 2026-09-17 19:31 UTCEPSS rescoreEPSS 2.0% · 80th percentile
Show 75 more
  1. 2026-09-16 14:08 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  2. 2026-09-16 05:15 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  3. 2026-09-15 03:11 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  4. 2026-09-13 23:53 UTCEG score recompute
  5. 2026-09-13 16:47 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  6. 2026-09-13 08:31 UTCEG score recompute
  7. 2026-09-12 03:43 UTCEG score recompute
  8. 2026-09-11 14:53 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  9. 2026-09-10 09:35 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  10. 2026-09-08 22:01 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  11. 2026-09-07 16:01 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  12. 2026-09-06 14:08 UTCEG score recompute
  13. 2026-09-06 13:47 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  14. 2026-09-05 22:53 UTCEG score recompute
  15. 2026-09-04 05:07 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  16. 2026-09-02 14:12 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  17. 2026-09-01 13:54 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  18. 2026-09-01 04:40 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  19. 2026-08-30 20:33 UTCEG score recompute
  20. 2026-08-30 19:17 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  21. 2026-08-30 07:42 UTCEG score recompute
  22. 2026-08-30 01:22 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  23. 2026-08-28 21:42 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  24. 2026-08-27 21:55 UTCEG score recompute
  25. 2026-08-27 14:25 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  26. 2026-08-27 01:58 UTCEG score recompute
  27. 2026-08-26 14:46 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  28. 2026-08-25 14:51 UTCEG score recompute
  29. 2026-08-25 13:49 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  30. 2026-08-24 20:38 UTCEG score recompute
  31. 2026-08-24 09:49 UTCEG score recompute
  32. 2026-08-23 02:40 UTCEG score recompute
  33. 2026-08-23 00:19 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  34. 2026-08-22 03:57 UTCEG score recompute
  35. 2026-08-21 23:49 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  36. 2026-08-20 23:13 UTCEG score recompute
  37. 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  38. 2026-08-20 02:12 UTCEG score recompute
  39. 2026-08-19 17:04 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  40. 2026-08-18 20:47 UTCEG score recompute
  41. 2026-08-18 13:48 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  42. 2026-08-17 22:33 UTCEG score recompute
  43. 2026-08-17 13:47 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  44. 2026-08-16 18:02 UTCEG score recompute
  45. 2026-08-16 14:56 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  46. 2026-08-16 02:44 UTCEG score recompute
  47. 2026-08-16 02:14 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  48. 2026-08-15 03:10 UTCEG score recompute
  49. 2026-08-15 01:30 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  50. 2026-08-14 00:43 UTCEG score recompute
  51. 2026-08-13 22:00 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  52. 2026-08-12 14:13 UTCEG score recompute
  53. 2026-08-12 13:51 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  54. 2026-08-11 15:34 UTCEG score recompute
  55. 2026-08-11 00:26 UTCEG score recompute
  56. 2026-08-11 00:00 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  57. 2026-08-09 14:25 UTCEG score recompute
  58. 2026-08-09 13:46 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  59. 2026-08-08 19:30 UTCEG score recompute
  60. 2026-08-08 16:37 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  61. 2026-08-07 17:04 UTCEG score recompute
  62. 2026-08-06 14:37 UTCEG score recompute
  63. 2026-08-06 13:47 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  64. 2026-08-05 19:43 UTCEG score recompute
  65. 2026-08-05 19:17 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  66. 2026-08-04 18:15 UTCEG score recompute
  67. 2026-08-04 15:10 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  68. 2026-08-04 14:04 UTCEG score recompute
  69. 2026-08-04 10:39 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  70. 2026-08-03 13:50 UTCEG score recompute
  71. 2026-08-03 10:36 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  72. 2026-08-02 03:34 UTCEG score recompute
  73. 2026-08-02 02:27 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  74. 2026-08-01 04:54 UTCEG score recompute
  75. 2026-08-01 04:16 UTCEPSS rescoreEPSS 1.3% · 68th percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-59800?
CVE-2026-59800 is a critical-severity vulnerability; its CVE record was 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 made public?
CVE-2026-59800 was made public on May 29, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on July 7, 2026. EchelonGraph's copy of the record carries a last-modified date of July 10, 2026; the record at its source may have been updated since.
Is CVE-2026-59800 actively exploited?
CVE-2026-59800 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.0% probability of exploitation in the next 30 days (80th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59800?
CVE-2026-59800 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59800?
A fix for CVE-2026-59800 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59800 are linked in the Vendor Advisories panel on this page.

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