Incorrect Type Conversion Vulnerability in BeamMCP Server by ScriptKittyOS
CVE-2026-104634

2.3LOW

Key Information:

Vendor

Scriptkittyos

Status
Beam Mcp
Vendor
CVE Published:
8 October 2026

What is CVE-2026-104634?

An incorrect type conversion vulnerability exists in the BeamMCP.Server component of ScriptKittyOS. This flaw allows JSON boolean arguments sent by an MCP client to be misrepresented as strings in the host's dispatch function. Specifically, 'true', 'false', and 'nil' are transformed into string format, causing atypical boolean evaluations in Elixir. This discrepancy can lead to unintended actions on the host, especially when the behavior diverges on the treatment of 'false' and 'true'. The vulnerability impacts versions of BeamMCP ranging from 0.1.0 to below 0.10.1, emphasizing the need for careful argument validation and normalization.

Affected Version(s)

beam_mcp 0.1.0 < 0.10.1

beam_mcp 083838eb8e17fe5f6fcaf761bdbe203110288b0b < 289dbdbad641943b29a3b8d1eb36506cc8cec10a

References

https://github.com/ScriptKittyOS/beam_mcp/security/adviso...
relatedvendor-advisory
https://cna.erlef.org/cves/CVE-2026-104634.html
related
https://osv.dev/vulnerability/EEF-CVE-2026-104634
related

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ayla Croft / Script Kitty OS
Ayla Croft / Script Kitty OS
Ayla Croft / Script Kitty OS
Jonatan Männchen / EEF
.