RCE in Horw Esp-Mcp
CVE-2026-117567
esp-mcp through commit 28afddf contains an OS command injection vulnerability that allows attackers to run arbitrary commands by supplying shell metacharacters in MCP tool parameters. Attackers influencing agent tool calls through prompt injection can inject metacharacters into target, port, project_path, or project_name values passed to asyncio.create_subprocess_shell, executing commands as the MCP server user.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/horw/esp-mcp/issues/49 (issue-tracking)
- github.com/horw/esp-mcp (product)
- github.com/horw/esp-mcp/blob/28afddf9ff41ada117bb45fd49b526d3bf89749e/main.py (technical-description)
- www.vulncheck.com/advisories/esp-mcp-through-commit-28afddf-os-command-injectio… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-117567?
- CVE-2026-117567 is a high-severity vulnerability in Horw Esp-Mcp, classified under OS Command Injection. CVSS score: 7.8/10. Published 2026-10-27.
- How severe is CVE-2026-117567?
- High severity. CVSS v3 base score is 7.8 out of 10.