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VulnerabilityPublished

CVE-2026-61542: drhelius Gearboy · Missing Authentication

Affects drhelius GearboySource CVE Database V5

0

Not known to be exploited · CVSS 8.6 High : upgrade to 3.8.7 soon.

Data as of 28 Oct 2026, 20:13 UTC

CVSS 3.1 base score
8.6High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 3.8.7
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade Gearboy and drhelius/Gearboy to 3.8.7.

Affected software

ProductAffectedFixed in
drheliusGearboyAffected
  • <3.8.7
Fixed in
  • 3.8.7
GitHubdrhelius/Gearboypkg:github/drhelius/GearboyOther threatsAffected
  • <3.8.7
Fixed in
  • 3.8.7

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Apply the official patch by upgrading Gearboy to version 3.8.7 or later, which fixes this vulnerability. Until patched, disable the MCP HTTP server mode or restrict network access to localhost only to prevent unauthenticated remote access.

Description

CVE-2026-61542 is a vulnerability in drhelius Gearboy emulator version prior to 3.8.7 where the optional MCP HTTP server mode accepts unauthenticated requests from any network peer. This allows remote peers to invoke emulator and debugging operations without authentication, potentially affecting the emulator process, debugging state, and local files used as media. The vulnerability is patched in Gearboy 3.8.7.

References

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