MCP Observatory
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tumf/mcp-shell-server

github

Secure MCP server for whitelisted shell command execution with stdin, argv pipelines, timeouts, and structured audit logging.

maintainer
tumf
license
MIT
first seen
2026-05-22
last seen
2026-08-09
releases · 30d
7
short id
risk 46/100 · heuristic grade
C elevated
  • vulnerabilities attested + 50
  • capability exposure inferred + 4
  • trust mitigators mixed − 8

attested inferred mixed

The A–E grade is our heuristic synthesis — a "review this" prompt, not a verdict. Each factor is tagged by what backs it: attested (a verifiable record), reported (a third party's claim), or inferred (our own heuristic, e.g. permissions). See methodology.

graded 3m ago · see ecosystem CVEs →

risk trajectory 2 movements
  • A · 14 → C · 46
  • A · 0 → A · 14
capability exposure grade factor +4
Inferred surface — each links to servers holding it:
vulnerabilities 11 CVEs · grade factor +50
HIGH
ALLOW_COMMANDS restriction bypass via git argument/config injection leads to arbitrary command exec… affects ["<= 1.1.1"]
HIGH
git argument policy denylists only 3 config keys (and only on `-c`), missing other executing keys … affects ["<=1.1.5"]
HIGH
Incomplete exec-capable-command denylist → allowlist bypass to arbitrary command execution affects ["<=1.1.5"]
HIGH
Per-command argument policy keys on exact basenames → alternate names (`gawk`/`gtar`/`gfind`) bypas… affects ["<=1.1.5"]
HIGH
Incomplete argument-hardening denylist allows allowlist bypass to arbitrary command execution (tar … affects ["<= 1.1.2"]
HIGH
Allowlisted git permits arbitrary command execution via git alias configuration affects ["<= 1.0.3"]
HIGH
Command allowlist bypass via sed 'e' function and find -fprintf (arbitrary command execution and ar… affects ["<= 1.1.2"]
HIGH
Allowlisted `git` permits arbitrary command execution via unfiltered `git -c` config keys (core.fsm… affects ["<= 1.1.1"]
MEDIUM
Duplicate report: literal pipe characters in argv could be reinterpreted as pipeline operators affects ["<= 1.1.7"]
MEDIUM
Literal pipe characters in argv could be reinterpreted as pipeline operators affects ["<= 1.1.7"]
MEDIUM
Default argument hardening in CommandValidator is bypassable via basename-equivalent interpreters (… affects ["<= 1.1.6"]
tool safety all quiet

No tool-safety findings — heuristic detectors run on the compute-risk cadence; a finding appears when a tool trips a rule.

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live risk-grade badge preview [![MCP Observatory risk grade](https://mcpobservatory.com/servers/mcpso:tumf/mcp-shell-server/badge.svg)](https://mcpobservatory.com/servers/mcpso:tumf/mcp-shell-server/security)

Heuristic, inferred signals — false positives (legitimately powerful tools, forks, language ports) are expected. Treat each as "review this", not a verdict. See the ecosystem-wide picture on the security hub, or the fleet security of tumf.