# CVE-2026-102610: fast-agent: `fast-agent serve` binds HTTP to 0.0.0.0 with no authentication by default; with --shell this is unauthenticated remote command execution

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

fast-agent is a framework for building, running, and evaluating AI agents with Model Context Protocol support. Prior to 0.7.21, fast-agent serve uses HTTP transport bound to 0.0.0.0 on port 8000 without authentication, allowing any network client that can reach the /mcp endpoint to invoke the exposed agent tool. When the server is started with --shell, the agent can call the local execute tool implemented by tools/local_shell_executor.py, so an unauthenticated remote client can cause operating-system commands to run as the server user; without --shell, the client can still consume the operator's model and configured MCP tools. The defaults are defined in cli/commands/serve.py and mcp/server/agent_server.py, and the non-interactive server permission prompt does not prevent the described access. This issue is fixed in version 0.7.21.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- evalstate / fast-agent: < 0.7.21 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 6.4 (medium); CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-78, CWE-306

## Exploit evidence

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

## References

- https://github.com/evalstate/fast-agent/security/advisories/GHSA-9vhv-g5hf-m7m7 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/evalstate/fast-agent/pull/828 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/evalstate/fast-agent/commit/ba99f89c3ec7f1ef1c8b1ebce381c12b60dfea29 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/evalstate/fast-agent/releases/tag/v0.7.21 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-102610; retrieved 2026-11-06; source updated 2026-11-06

Revision: b5e1c43f77f578543ccde0ef5665bb80cebd3a22a19c21764fcd1ad07290290c

Canonical: https://y2.dev/cve/CVE-2026-102610

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