# CVE-2026-54140: OpenHuman: MCP tool description injection: untrusted server descriptions execute in agent LLM context without sanitization

Status: published. Published: 2026-11-05. Updated: 2026-11-06.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- tinyhumansai / openhuman: < 0.57.13 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 8.3 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H; source: CNA: GitHub_M

- CVSS 3.1: 8.3 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-1427

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/tinyhumansai/openhuman/security/advisories/GHSA-g6j9-89xv-v752 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/tinyhumansai/openhuman/pull/3215 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/tinyhumansai/openhuman/commit/00b8a669c6e6391a1be9f724bd9c8f755ee3c43e (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/tinyhumansai/openhuman/releases/tag/v0.57.13 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/tinyhumansai/openhuman/commit/00b8a669c6e6391a1be9f724bd9c8f755ee3c43e (security-advisories@github.com)

- https://github.com/tinyhumansai/openhuman/pull/3215 (security-advisories@github.com)

- https://github.com/tinyhumansai/openhuman/releases/tag/v0.57.13 (security-advisories@github.com)

- https://github.com/tinyhumansai/openhuman/security/advisories/GHSA-g6j9-89xv-v752 (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-54140; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54140; retrieved 2026-11-07; source updated 2026-11-06

Revision: 2f1c3a7663b4b8162114c996a15918198cfe01e4ebd05192311d9a0e7a8ec387

Canonical: https://y2.dev/cve/CVE-2026-54140

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.