OpenHuman: MCP tool description injection: untrusted server descriptions execute in agent LLM context without sanitization

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54140
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-05 17:18:18 UTC
Updated2026-11-06 21:41:14 UTC
DescriptionOpenHuman is an open-source agent harness available as a desktop application and Rust library. Before 0.57.13, OpenHuman places names, descriptions, titles, and parameter definitions returned by configured external MCP servers into the agent model context without neutralizing instructions or bounding the descriptive fields. The McpRemoteTool records produced by list_tools preserve this remote content, while tool filtering considers the tool name and the prompt-injection detector screens user messages rather than MCP definitions. A malicious or compromised MCP server can therefore return a poisoned description that is evaluated on every agent turn and may direct the model to invoke other available tools, disclose accessible data, or perform unauthorized actions without a separate malicious user message. The issue affects users who configure an attacker-controlled or compromised MCP server. This issue is fixed in version 0.57.13.

Risk And Classification

Primary CVSS: v3.1 8.3 HIGH from [email protected]

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

EPSS: 0.005540000 probability, percentile 0.464190000 (date 2026-11-06)

Problem Types: CWE-1427 CWE-1427:

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.3HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
3.1CNADECLARED8.3HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Tinyhumansai Openhuman affected < 0.57.13 Not specified

References

ReferenceSourceLinkTags
github.com/tinyhumansai/openhuman/pull/3215 [email protected] github.com
github.com/tinyhumansai/openhuman/releases/tag/v0.57.13 [email protected] github.com
github.com/tinyhumansai/openhuman/commit/00b8a669c6e6391a1be9f724bd9c8f7... [email protected] github.com
github.com/tinyhumansai/openhuman/security/advisories/GHSA-g6j9-89xv-v752 [email protected] github.com
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