io.github.doublegate/cyberchef-mcp

What we checked

Six static checks, weighted by risk. Every result reflects only what could be observed in the published package and repository — never intent.

• Injection surface

  unscannable25% of grade

  Tool descriptions/manifest scanned for instruction-injection patterns (imperatives at the model, hidden text, 'ignore previous', data-exfil URLs).

  No tool descriptions, server instructions, prompts, or resources were fetched; nothing to scan for injection.

• Supply chain

  warn25% of grade

  Package provenance: namespace verification, repo linkage, maintainer count, account age, postinstall scripts, typosquat distance.

  install hook "postinstall" present and not a recognized benign build command; dependency "d3" is edit-distance 2 from popular package "ws" (typosquat candidate); dependency "url" is edit-distance 2 from popular package "ora" (typosquat candidate); dependency "cbor2" is edit-distance 2 from popular package "@babel/core" (typosquat candidate); dependency "jsesc" is edit-distance 2 from popular package "jest" (typosquat candidate); dependency "nodom" is edit-distance 2 from popular package "@types/node" (typosquat candidate); dependency "rison" is edit-distance 2 from popular package "sinon" (typosquat candidate); dependency "node-md6" is edit-distance 2 from popular package "nodemon" (typosquat candidate); dependency "crypto-js" is edit-distance 2 from popular package "bcryptjs" (typosquat candidate); dependency "@astronautlabs/amf" is edit-distance 2 from popular package "pm2" (typosquat candidate); dependency "@opentelemetry/api" is edit-distance 2 from popular package "pg" (typosquat candidate); dependency "@modelcontextprotocol/node" is edit-distance 2 from popular package "@babel/core" (typosquat candidate); dependency "@modelcontextprotocol/server" is edit-distance 1 from popular package "semver" (typosquat candidate)

• Credential hygiene

  fail15% of grade

  How the server takes secrets (env vs plaintext config vs hardcoded); secrets appearing in tool schemas.

  src/core/operations/ECDSASign.mjs: embeds a PRIVATE KEY block. Reads secrets from the environment (e.g. src/node/lib/bootstrap-config.mjs) — the recommended intake shape.

• Permission scope

  warn15% of grade

  Declared tools vs. breadth (filesystem, network, exec); flags shell-exec and unbounded filesystem access.

  has both shell/exec and network egress — capable of download-and-run, though no such path was observed (src/core/config/scripts/newMinorVersion.mjs: imports child_process and calls exec/spawn; src/node/lib/auth.mjs: outbound HTTP/socket call). has both shell/exec and destructive filesystem writes (src/core/config/scripts/newMinorVersion.mjs: imports child_process and calls exec/spawn; src/core/config/scripts/generateConfig.mjs: destructive/writing fs.* call (write/unlink/rm/chmod/rename)). discloses shell/exec capability: src/core/config/scripts/newMinorVersion.mjs: imports child_process and calls exec/spawn discloses broad/destructive filesystem access: 7 files (src/core/config/scripts/generateConfig.mjs, src/core/config/scripts/generateHTMLEntities.mjs, src/node/config/scripts/generateNodeIndex.mjs, +4 more) Capability DISCLOSURE, not a verdict: static analysis sees the primitive is present and reachable, not whether its use is attacker-controlled.

• Version behavior

  fail10% of grade

  Diff of tool definitions between versions; new permissions or changed descriptions in a patch release (the postmark-mcp class).

  vs prior 3.8.0 (minor bump): new capability primitive(s) in source: child_process, fs-write, http-client; new hardcoded outbound host/BCC destination(s): api.github.com, asecuritysite.com, cloudflare-dns.com, datatracker.ietf.org, developer.mozilla.org, developers.cloudflare.com, developers.google.com, didierstevens.com, dns.google.com, docs.jsonata.org, docs.mongodb.com, en.wikipedia.org, engineering.salesforce.com, forensics.wiki, gist.githubusercontent.com, github.com, goessner.net, hitchhikers.fandom.com, host, html.spec.whatwg.org, isc.sans.edu, json-schema.org, learn.microsoft.com, link.springer.com, lorenz.virtualcolossus.co.uk, manual-snort-org.s3-website-us-east-1.amazonaws.com, mcp.example.com, medium.com, momentjs.com, nodejs.org, npmjs.org, numberwang.wikia.com, pieroxy.net, reveng.sourceforge.io, stackoverflow.com, tools.ietf.org, virtualcolossus.co.uk, w3c.github.io, wikipedia.org, www.dcode.fr, www.hotpixel.net, www.iana.org, www.ietf.org, www.phpinternalsbook.com, www.reddit.com, www.rfc-editor.org, www.wikipedia.org.

• Transport config

  warn10% of grade

  Remote servers: TLS and auth mode (none/token/OAuth). Local servers: whether the manifest indicates it phones home.

  sends telemetry to third-party SDK (Datadog) — disclosure, verify opt-in; manifest/source references telemetry behavior — disclosure