---
title: "CVE-2026-61542: Gearboy Gearsystem - Authentication Bypass"
description: "Gearboy Gearsystem contains an insecure MCP HTTP mode caused by binding to INADDR_ANY and lack of authorization checks on MCP requests, letting remote attackers invoke emulator/debugging operations, exploit requires network access to MCP port."
url: https://panop.io/threat-heartbeat/CVE-2026-61542/
---

# CVE-2026-61542 Gearboy Gearsystem - Authentication Bypass

Gearboy Gearsystem contains an insecure MCP HTTP mode caused by binding to INADDR\_ANY and lack of authorization checks on MCP requests, letting remote attackers invoke emulator/debugging operations, exploit requires network access to MCP port.

CVSS base score 8.6 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-61542)

## Details

Type

Authentication Bypass

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-306](https://cwe.mitre.org/data/definitions/306.html)

## Vendor fix

Update to Gearboy version 3.8.7 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-61542](https://nvd.nist.gov/vuln/detail/CVE-2026-61542)
- [https://github.com/drhelius/Gearboy/commit/e2ead98e2fac41e9df5a499e9e421c6a0e73f1bc](https://github.com/drhelius/Gearboy/commit/e2ead98e2fac41e9df5a499e9e421c6a0e73f1bc)
- [https://github.com/drhelius/Gearboy/releases/tag/3.8.7](https://github.com/drhelius/Gearboy/releases/tag/3.8.7)
- [https://github.com/drhelius/Gearboy/security/advisories/GHSA-fmvx-487g-mrww](https://github.com/drhelius/Gearboy/security/advisories/GHSA-fmvx-487g-mrww)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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