{"id":"CVE-2026-102610","published":"2026-11-06T21:17:05.677","lastModified":"2026-11-09T23:17:10.513","description":"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.","cvssScore":6.4,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H","cwes":["CWE-78","CWE-306"],"vendors":[],"products":[],"references":[{"url":"https://github.com/evalstate/fast-agent/commit/ba99f89c3ec7f1ef1c8b1ebce381c12b60dfea29","tags":[]},{"url":"https://github.com/evalstate/fast-agent/pull/828","tags":[]},{"url":"https://github.com/evalstate/fast-agent/releases/tag/v0.7.21","tags":[]},{"url":"https://github.com/evalstate/fast-agent/security/advisories/GHSA-9vhv-g5hf-m7m7","tags":[]}],"exploitRefs":[{"url":"https://github.com/evalstate/fast-agent/commit/ba99f89c3ec7f1ef1c8b1ebce381c12b60dfea29","tags":[]},{"url":"https://github.com/evalstate/fast-agent/pull/828","tags":[]},{"url":"https://github.com/evalstate/fast-agent/releases/tag/v0.7.21","tags":[]},{"url":"https://github.com/evalstate/fast-agent/security/advisories/GHSA-9vhv-g5hf-m7m7","tags":[]}],"hasPoc":true,"ai":null}