Bug 2567638 (CVE-2026-54140)

Summary: CVE-2026-54140 openhuman: openhuman: Unauthorized action execution via untrusted MCP server tool definitions
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OpenHuman. The application incorporates tool descriptions and parameters from external Model Context Protocol (MCP) servers directly into the model context without proper sanitization or boundaries. A malicious or compromised MCP server can exploit this vulnerability to execute indirect prompt injection, directing the agent to invoke unauthorized tools, disclose sensitive data, or perform unintended actions.
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Description OSIDB Bzimport 2026-11-05 22:14:02 UTC 
OpenHuman 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.