https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-10-03T12:03:05.807896+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/cve-2026-55581 CVE-2026-55581 — mcp-shell: Secure Mode Allowlist Bypass via Default `/bin/bash` Executable 2026-10-03T12:03:06.338427+00:00

Affected: sonirico mcp-shell

mcp-shell is an MCP server for running shell commands securely, auditably, and on demand. Prior to 0.6.0, the default Docker security.yaml includes /bin/bash in allowed_executables, while security.go validates only the first token and checkBlockedPatternsAndCommands does not reject the shell command-mode flag -c. A caller of the shell_exec MCP tool can provide the command argument `/bin/bash -c <arbitrary-command>`, which passes validation and reaches executor.go, where parseCommand and exec.CommandContext execute the arbitrary command as mcpuser outside the intended allowlist. This issue is fixed in version 0.6.0.