CVE-2026-59800 (GCVE-0-2026-59800)

Vulnerability from cvelistv5 – Published: 2026-07-07 18:19 – Updated: 2026-07-07 19:08 X_Open Source X_Known Exploited Vulnerability
VLAI Shadowserver KEVIntel
Title
9Router < 0.4.44 - OS Command Injection via sudoPassword Parameter in Tailscale Install Endpoint
Summary
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).
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
Impacted products
Vendor Product Version
decolua 9router Affected: 0 , < 0.4.44 (semver)
Unaffected: 0.4.44 (semver)
Create a notification for this product.
Date Public
2026-05-29 00:00
Credits
Vũ Chí Thành (@vcth4nh) Huỳnh Đức Tin (@Ductinn)
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2026-59800

Status: Confirmed

Status Updated: 2026-07-31 07:42 UTC

Exploited: Yes


Characteristics
Severity: 98.0

Timestamps
First Seen: 2026-07-31
Asserted: 2026-07-31
Last Seen: 2026-07-31

Scope
Asset Exposure: ['internet-facing']
Notes: Affected: decolua / 9router | Class: ai-system | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: no | Honeypot connections on 2026-07-31: 13

Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver


Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class ai-system
7D Avg 0
Vendor decolua
30D Avg 0
90D Avg 0
Product 9router
Cisa Kev no
Connections 13
Observation Date 2026-07-31
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical

References

Created: 2026-08-02 01:00 UTC | Updated: 2026-08-02 01:00 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2026-59800

Status: Confirmed

Status Updated: 2026-07-31 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2026-07-31
Asserted: 2026-07-31

Scope
Notes: 9Router < 0.4.44 - OS Command Injection via sudoPassword Parameter in Tailscale Install Endpoint | Affected: decolua / 9router | CVSS: 9.2 (CRITICAL) | EPSS: 0.01338 | Used in malware: unknown | Not yet in CISA KEV: True

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel


Details
Feed KEVIntel (kevintel.com)
Title 9Router < 0.4.44 - OS Command Injection via sudoPassword Parameter in Tailscale Install Endpoint
Vendor decolua
Product 9router
Added Date 2026-07-31T00:00:00.000Z
Cvss Score 9.2
Epss Score 0.01338
Cvss Severity CRITICAL
Epss Percentile 0.68457
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True

References

Created: 2026-08-01 11:00 UTC | Updated: 2026-08-01 11:00 UTC
Show details on NVD website

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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