io.github.yaver-io/yaver

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; install hook "preuninstall" present and not a recognized benign build command

• Credential hygiene

  pass15% of grade

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

  Reads secrets from the environment (e.g. src/agent-runtime.js) — the recommended intake shape. PASS = no static red flag; static analysis cannot prove the code honors env-based secret handling at runtime.

• Permission scope

  fail15% of grade

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

  HIGH: shell/exec capability AND network egress together — download-and-execute risk (src/agent-runtime.js: imports child_process and calls exec/spawn; src/hermesc-runtime.js: outbound HTTP/socket call). HIGH: shell/exec capability AND destructive filesystem writes together (src/agent-runtime.js: imports child_process and calls exec/spawn; src/agent-runtime.js: destructive/writing fs.* call (write/unlink/rm/chmod/rename)). discloses shell/exec capability: src/agent-runtime.js: imports child_process and calls exec/spawn discloses shell/exec capability: src/bundler.js: imports child_process and calls exec/spawn discloses shell/exec capability: src/commands/deploy.js: imports child_process and calls exec/spawn discloses shell/exec capability: src/commands/feedback.js: imports child_process and calls exec/spawn discloses shell/exec capability: src/hermesc-runtime.js: imports child_process and calls exec/spawn discloses shell/exec capability: src/postinstall.js: imports child_process and calls exec/spawn discloses shell/exec capability: src/preuninstall.js: imports child_process and calls exec/spawn discloses shell/exec capability: src/commands/run.js: imports child_process and calls exec/spawn discloses shell/exec capability: src/update-check.js: imports child_process and calls exec/spawn discloses broad/destructive filesystem access: src/agent-runtime.js: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/agent-runtime.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/bundler.js: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/commands/devices.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/commands/feedback.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/hermesc-runtime.js: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/index.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/commands/init.js: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/commands/init.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/commands/modules.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/postinstall.js: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/commands/reset.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/commands/status.js: path traversal ('../') combined with file access discloses broad/destructive filesystem access: src/update-check.js: destructive/writing fs.* call (write/unlink/rm/chmod/rename) discloses broad/destructive filesystem access: src/update-check.js: path traversal ('../') combined with file access Capability DISCLOSURE, not a verdict: static analysis sees the primitive is present and reachable, not whether its use is attacker-controlled.

• Version behavior

  unscannable10% of grade

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

  no prior version to diff (first sight of io.github.yaver-io/[email protected]); version-drift / rug-pull cannot be evaluated. Cold-start risk is covered by point-in-time checks (injection_surface, supply_chain, credential_hygiene), not here.

• Transport config

  fail10% of grade

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

  source performs runtime self-update / download-and-execute (bypasses version_behavior); manifest/source references beacon behavior — disclosure