CVE-2026-81097Public exploitHinoki check available

Host command execution via unguarded PTY spawn

Published Aug 27, 2026 · Updated Aug 27, 2026

OS command injection in Maquina Rails MCP Server 1.4.0 through 1.6.0 allows local users to execute host commands through execute_ruby. The tool permits require "pty" while its denylist and Kernel method replacements leave PTY.spawn and PTY.getpty unguarded. A local operator or a coding agent acting for that operator must submit the Ruby call; commands run with the server account's privileges.

CVSS severity8.6
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

OS command injection in Maquina Rails MCP Server 1.4.0 through 1.6.0 allows local users to execute host commands through execute_ruby. The tool permits require "pty" while its denylist and Kernel method replacements leave PTY.spawn and PTY.getpty unguarded. A local operator or a coding agent acting for that operator must submit the Ruby call; commands run with the server account's privileges.

The record

CVE
CVE-2026-81097
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Maquina
Product
Rails MCP Server
Classifications
CWE-78, T1059
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=1.4.0 <=1.6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Maquina · Rails MCP Serverversion=1.4.0 <=1.6.0

Published CVSS scores

8.6VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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