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Is Rebar MCP server safe?

Probably. Read the findings first.

C60/100grade C

Use with care. Some checks failed or could not be verified.

What to know before installing
  • highShell command built from a string (injection risk)

Public scan report

scanner v0.1.9 · 2026-09-20 · same rubric, same numbers if you re-run it

1 high2 medium
  • Code scan785 source files scanned3/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 0 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year9/10

Findings (3)

  • mediumsubprocess with shell=Trueexec.shell-true
    nava_rebar-0.13.1/src/rebar/_commands/compact_txn.py: …-out (no such subcommand existed; ``shell=True`` injection smell).""" from rebar._…
  • mediumeval / new Function usedexec.eval
    nava_rebar-0.13.1/src/rebar/grounding/detectors/builtin/security_owasp_cwe.yaml: … message: "Dynamic code execution via eval()/exec() — code-injection risk (CWE-94).…
  • highShell command built from a string (injection risk)exec.shell-concat
    nava_rebar-0.13.1/src/rebar/llm/eval_specs/code-review-base.eval.yaml: …git.py @@ -4,2 +4,3 @@ - subprocess.run(f"git -C {d} add -A", shell=True) + …
Overall 60/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

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Rebar reviews, tools and install